Chemical Process Flashcards
Oxidation of SO2 to SO3 is favoured by
low temperature and low pressure.
low temperature and high pressure.
high temperature and low pressure.
high temperature and high pressure.
low temperature and high pressure.
Gun powder, which is an explosive comprises of charcoal, sulphur and
glycerene
salt petre
nitro glycerene
dynamite
salt petre
Starting raw material for the manufacture of alum is
alumina
gypsum
bauxite
ammonium bicarbonate
bauxite
Salt cake is chemically represented by
Na2SO4
CaSO4.H2O
MgSO4
BaSO4
Na2SO4
Which of the following sugars is the sweetest?
Glucose
Fructose
Sucrose
Lactose
Fructose
Paper pulp produced by kraft/sulphate process is
bleached easily
dull white in color
strong fibrous
dark colored
strong fibrous
Claude process of gas liquefaction employs
merely compression of gas beyond its critical pressure.
Joule-Thomson expansion cooling.
heat exchange with colder stream.
adiabatic expansion against a piston or in a turbine.
adiabatic expansion against a piston or in a turbine.
The main use of HCl is in the
drilling of petroleum wells and pickling of steel sheets.
manufacture of cationic detergent.
treatment of spent fuel of nuclear reactor.
none of these.
drilling of petroleum wells and pickling of steel sheets.
The gasification reaction represented by, C + H2O = CO + H2, is a/an __________ reaction.
exothermic
endothermic
catalytic
autocatalytic
endothermic
Viscose rayon is chemically
cellulose nitrate
regenerated cellulose nitrate
cellulose acetate
regenerated cellulose acetate
regenerated cellulose acetate
All enzymes are made of
fats
carbohydrates
proteins
amino acids
proteins
The combustion reaction, C + O2 = CO2, is
exothermic
endothermic
autocatalytic
none of these
exothermic
Styrene is produced from ethyl benzene by the process of
dehydrogenation
oxidation
alkylation
dehydration
dehydrogenation
Gelatine which is a nitrogenous organic protein is obtained by the hydrolysis of
callagen
tannin
molasses
carbohydrate
callagen
The chamber process is
preferred over contact process for producing 98 to 100% H2SO4 and various oleums.
non-catalytic and operates only on pyrites.
a batch process for directly producing high strength (98 to 100%) H2SO4.
none of these.
none of these.
Sucrose content in the raw juice extracted from sugar cane is about __________ percent.
1 - 2
15 - 20
50 - 60
80 - 85
15 - 20
Fusel oil is a/an
essential oil.
extract from medicinal herbs.
mixture of higher molecular weight alcohols (a by-product obtained during production of alcohol from molasses).
none of these.
mixture of higher molecular weight alcohols (a by-product obtained during production of alcohol from molasses).
Styrene-butadiene-rubber (SBR) as compared to natural rubber has
Poorer tensile strength.
poorer resistance to oxidation.
greater amount of heat build-up under heavy loading.
all (a), (b) and (c).
all (a), (b) and (c).
Co-efficient of thermal expansion of glass is decreased by the addition of __________ during its manufacture.
CaO
MnO2
ZnO
FeS
ZnO
The catalyst used in the manufacture of DDT (from chloral and chlorobenzene) is
dilute H2SO4
oleum
ultraviolet light
none of these
oleum
Haemoglobin is a/an
amino acid
biological catalyst
protein
enezyme
protein
Epoxy resin
is a good adhesive.
is an elastomer.
cannot be used for surface coatings.
is a polyester.
is a good adhesive.
Concentration of NaOH solution produced by mercury electrolytic cell is about __________ percent.
10
25
50
98
50
Which of the following is the most adverse factor challenging the choice of mercury electrolytic cell process for the production of caustic soda?
High cost of mercury.
High specific gravity of mercury.
Non-availability of high purity mercury.
Pollution of water stream by mercury.
Pollution of water stream by mercury.
Esterification reaction produces
detergent
vanaspati
soap
mercaptans
soap
Wood charcoal is used for decolouration of sugar, because it __________ the coloured materials.
adsorbs
oxidises
reduces
converts
adsorbs
Producer gas consists mainly of
CO, CO2 N2, H2
CO, H2
H2, CH4
C2H2, CO2, H2
CO, CO2 N2, H2
Neoprene is the trade name of
polyurathane
phenol formaldehyde
polychloroprene
styrene-butadiene rubber
polychloroprene
Hard water
does not affect the lather formation by soap.
is not unfit for drinking purpose.
pollutes the water stream.
all (a), (b) and (c).
is not unfit for drinking purpose.
Which of the following is an organo-metal-lic compound ?
Isopropyl alcohol
Tetra-ethyl lead
Zeolite
Cumene
Tetra-ethyl lead
Sulphur addition in soap is done to
improve the soap texture.
cure pimples & dandruff.
fasten lather formation.
increase its cleansing action.
cure pimples & dandruff.
Phosphate rock is a raw material for the manufacture of
phosphoric acid
phosphorous
superphosphates
all (a), (b) and (c)
all (a), (b) and (c)
Mineral oils (e.g. petroleum oils) are preferred over fatty oils (e.g. mustard oil, ghee, tallow, palm oil, olive oil etc.) as a lubricant due to its
poor oxidation stability and high gum forming tendency.
greater tendency of decomposition at elevated temperature.
hydrolysis tendency in presence of water.
all (a), (b) and (c).
all (a), (b) and (c).
Which of the following is not a raw material used for the manufacture of ordinary glass?
Iron oxide
Soda ash
Limestone
Silica
Iron oxide
Esterification reaction
produces soap.
is reversible.
is a reaction between an alcohol and an organic acid.
all (a), (b) and (c).
all (a), (b) and (c).
In sulphate pulp manufacture, the pressure and temperature in the digestor is
10 atm., 800 °C
10 atm., 170-180°C
1 atm., 170 - 180°C
l atm., 800°C
10 atm., 170-180°C
Zeolite removes both temporary as well as permanent hardness of water by precipitating calcium and magnesium present in water as insoluble zeolites. Used zeolite is regenerated by flushing with the solution of
calcium sulphate
sodium chloride
sodium sulphate
magnesium chloride.
sodium chloride
Pick out the endothermic reaction out of the following.
C+O2 = CO
CO + 3H2 = CH4 + H2O
CaCO3 = CaO + CO2
CO +O2 = CO2
CaCO3 = CaO + CO2
Pasteurisation of milk means
removal of fatty and albuminous substance from it.
killing of organisms present in it by heating it at controlled temperature without changing its natural characteristics.
inhibiting the growth of micro-organisms without killing them.
none of these.
killing of organisms present in it by heating it at controlled temperature without changing its natural characteristics.
Fusion of bauxite and __________ produces high alumina cement.
alum
limestone
coke
quartz
limestone
__________ process is used for the manufacture of sodium carbonate by ammonia soda process.
Ostwald’s
Bosch
Solvay
Haber’s
Solvay
Polycaprolactum is commercially known as
nylon-6
nylon-66
dacron
rayon
nylon-6
Frasch process is for
making oxygen
producing helium
mining sulphur
making nitrogen
mining sulphur
Very fine suspended and colloidal impurities are removed from water by a process called
sedimentation
coagulation
disinfection
softening
coagulation
Pitch (a product of coal tar distillation) is always mixed with creosote oil, when it is to be burnt in a burner, because
its calorific value is very less.
tar neutralises the residual acids present in pitch.
it reduces viscosity and imparts fluidity for its transportation through pipelines at economic pressure drop.
all (a), (b) and (c).
it reduces viscosity and imparts fluidity for its transportation through pipelines at economic pressure drop.
Which is the main reducing agent during production of iron from iron ore in a blast furnace ?
C
CO
CO2
H2
CO
The drug used in contraceptives is
sulphadizene
mestranol
methyl salicylate
pencillin
mestranol
Raw materials used for producing __________ cement does not contain iron oxide.
waterproof
slag
white
pozzolan
white
In the Lurgi coal gasifier
coking coals cannot be used.
low carbon conversion efficiency is achieved.
entrainment of solids is higher.
large quantity of coal can be processed.
large quantity of coal can be processed.
Neon gas is
flammable in nature.
used in color discharge tube.
filled in lamps having tungsten filament.
all (a), (b) and (c).
used in color discharge tube.
Calgon used in water treatment is chemically
sodium phosphate
sodium hexametaphosphate
calcium phosphate
tricresyl phosphate
sodium hexametaphosphate
Which oil is preferred for paint manufacture ?
Drying oil
Non-drying oil
Semi-drying oil
Saturated oil
Drying oil
Styrene butadiene rubber (SBR) is
a natural rubber.
a synthetic polymer.
a synthetic monomer.
another name of silicone rubber.
a synthetic polymer.
Ethylene oxide is produced by oxidation of ethylene in presence of AgO catalyst at
1 atm & 100°C
5 atm & 275°C
100 atm & 500°C
50 atm & 1000°C
5 atm & 275°C
Glycerine is not used in the
manufacture of explosive.
conditioning and humidification of tobacco.
manufacture of pharmaceuticals.
none of these.
none of these.
Cumene is the starting material for the production of
benzoic acid
phenol and acetone
isoprene
styrene
phenol and acetone
The type of high refractive index glass used in optical instruments is __________ glass.
pyrex
flint
crookes
none of these
flint
Oxidation of ortho-xylene in presence of __________ catalyst is done to produce phthalic anhydride on commercial scale.
nickel
vanadium
alumina
iron
vanadium
Most commonly used rubber vulcanising agent is
sulphur
bromine
platinum
alumina
sulphur
Terylene is
same as dacron
a polyester
both (a) & (b)
neither (a) nor(b)
both (a) & (b)
Free alkali in a toilet soap is __________ that in a laundary shop.
less than
more than
same
none of these
less than
Dehydrogenation of isopropanol produces
propyl alcohol
acetone
trichloroethylene
formaldehyde
acetone
Pick out the wrong statement.
Eosin requirement in tallow soap is about 40-50% which fastens the lather formation, softens the hard soaps and increases its cleansing action.
Soap powder is prepared by mixing soap with hydrated sodium carbonate.
Detergents differ from soaps in their action in hard water.
Tarnish inhibitor (e.g., benzotriazole) is added in soap to facilitate the removal of stains due to tea, blood etc.
Tarnish inhibitor (e.g., benzotriazole) is added in soap to facilitate the removal of stains due to tea, blood etc.
Concentration of hydrogen peroxide is done by
crystallisation
vacuum crystallisation
atmospheric distillation
dehydration
vacuum crystallisation
Helium is produced on commercial scale from
air
natural gas
coke oven gas
none of these
natural gas
Fermentation of molasses to produce ethyl alcohol is done at __________ °C
20 - 30
< - 5
100 - 150
250 - 300
20 - 30
The catalyst used in the manufacture of DDT is
alumina.
silica.
20% oleum.
aluminium chloride.
20% oleum.
Most widely and commonly used coagulant for the removal of suspended impurities in water is
bleaching powder
slaked lime
alum
copper sulphate
alum
_________ is used as a catalyst in fat splitting.
ZnO
Ni
V2O5
FeO
ZnO
Which of the following is not produced on commercial scale from sea water?
Bromine.
Magnesium compounds.
Potassium compounds.
Sodium sulphate.
Sodium sulphate.
Heating of __________ to 120°C, produces plaster of paris.
blue vitriol
gypsum
calcium silicate
calcium sulphate
gypsum
Pick out the wrong statement.
Conversion of SO2 to SO3 in Monsanto-4 pass converter is about 98%.
The chemical formula of oleum is H2S2O7, which is formed by saturating sulphuric acid with sulphur trioxide.
Vitriol oil is nothing but technical sulphuric acid.
Decomposition of sulphuric acid on heating does not start before its boiling.
Decomposition of sulphuric acid on heating does not start before its boiling.
Which of the following has sodium bicarbonate as its main constituent ?
Baking soda
Baking powder
Washing soda
none of these
Baking powder
Ordinary glass is not a/an
amorphous isotropic material.
supercooled liquid.
material with sharp definite melting point.
electrical insulator.
material with sharp definite melting point.
In premitive days, __________ was being manufactured by Leblanc Process.
alum
washing soda
soda ash
calcium carbide
soda ash
The only commercial Fischer-Tropsch plant for producing liquid hydrocarbon fuel from coal is located at
SASOL (in South Africa).
Redcar (U.K.).
Los-Angles (U.S.A.).
Trombay (India).
SASOL (in South Africa).
Lurgi coal gasifier is a pressurised __________ bed reactor.
moving
fixed
fluidised
entrained
moving
Oils are partially hydrogenated (not fully) to manufacture vanaspati, because fully saturated solidified oils
cause cholesterol build up and blood clotting.
are prone to rancid oxidation.
always contain some amount of nickel (as their complete removal is very difficult).
have affinity to retain harmful sulphur compounds.
cause cholesterol build up and blood clotting.
Paper grade bamboo contains about __________ percent cellulose.
5
20
40
60
5
Carboxymethyl cellulose (CMC) is added in detergents to act as a/an
surfactant
builder
optical brightening agent
anti soil redeposition agent
anti soil redeposition agent
Vulcanisation of rubber
decreases its tensile strength.
increases its ozone & oxygen reactivity.
increases its oil & solvent resistance.
converts its plasticity into elasticity.
converts its plasticity into elasticity.
Raw materials for ‘Solvay Process’ for manufacture of the soda ash are
salt, limestone and coke or gas.
ammonia, salt and limestone.
ammonia limestone and coke.
none of these.
salt, limestone and coke or gas.
Chloral is used in the manufacture of
DDT
BHC
parathion
none of these
DDT
Bromine is used in the preparation of
fire extinguishing compounds.
fire proofing agents.
dyes and antiknock compounds.
all (a), (b) and (c).
all (a), (b) and (c).
The process used for the manufacture of ethyl alcohol from molasses is
distillation
dehydration
dehydrogenation
none of these
none of these
Most easily and cheaply available fibrous raw material for paper manufacture available in India is bamboo. The yield of pulp produced from fibrous raw material by mechanical process is about __________ percent.
75
< 10
> 30
50
< 10
Absorption of SO3 in 97% H2SO4 is
exothermic
endothermic
not possible
none of these
exothermic
__________ process is used for the commercial production of nitric acid by the catalytic oxidation of ammonia.
Solvay
Ostwald’s
Haber’s
none of these
Ostwald’s
Sulphuric acid solution having a specific gravity of 1.20 at room temperature is used mainly for the
fertiliser manufacture
car battery solution
synthesis of oleum
water treatment
car battery solution
The catalyst used in the production of elemental sulphur from H2S (by oxidation-reduction) is
alumina
silica gel
platinum
nickel
alumina
A good quality coal should have
low fusion point of ash
high ash content
high sulphur content
none of these
none of these
Zeolite used in water softening process (cation exchange) is regenerated by washing with
brine
chloramines
sodium bisulphite
liquid chlorines
brine
The catalyst used in shift converter is
nickel
vanadium
silica gel
alumina
nickel
Which of the following is a detergent ?
Benzene hexachloride
Alkyl benzene sulphonate
Polytetraflouroethylene
Cellulose nitrate
Alkyl benzene sulphonate
Drinking (potable) water treatment does not involve
coagulation
sedimentation
softening
disinfection
softening
Phenol formaldehyde resin is used as an adhesive in making
laminates
card boxes
furniture
books
laminates
Pick out the correct statement.
A fat is converted into oil by its hydrogenation.
There is no difference between a fat and an oil so far as its physical properties are concerned.
All vegetable oils except coconut oil, contains fatty acids having more than sixteen carbon atoms.
Vegetable oils are classified as drying, non-drying and semi drying oils depending upon their fatty acids content.
All vegetable oils except coconut oil, contains fatty acids having more than sixteen carbon atoms.
DDT should not be allowed to come in contact with iron (during its manufacture) to
avoid its decomposition.
prevent sulphonation of the monochlorobenzene by the acid catalyst.
achieve non-hygroscopic property.
none of these.
avoid its decomposition.
Catalyst used in the manufacture of sulphuric acid by chamber & contact processes are respectively
V2O5 & Cr2O3.
oxides of nitrogen & Cr2O3.
V2O5 on a porous carrier & oxides of nitrogen.
oxides of nitrogen & V2O5 on a porous carrier.
oxides of nitrogen & V2O5 on a porous carrier.
DDT stands for
diethyl-diphenyl-trichloromethane.
dichloro-diphenyl-trichloromethane.
diphenyl-dichloro-trichloromethane.
dichloro-diphenyl-trichloroethane.
dichloro-diphenyl-trichloroethane.
Phosphoric acid is prepared from
cryolite
chalcopyrite
rock phosphate
none of these
rock phosphate
Metallic soap (e.g. aluminium or calcium salts of fatty acids) can be used
as a lubricant.
as a rust preventive.
in hard water for cleaning of cloth.
as a foam depressant in distillation column.
as a lubricant.
Which of the following processes does not produce Cl2 as a co-product during the manufacture of caustic soda ?
Diaphragm electrolytic cell process
Mercury electrolytic cell process
Lime-soda process
None of these
Lime-soda process
Bleaching action of bleaching powder is due to its __________ properties.
reducing
oxidising
disinfecting
none of these
oxidising
Solvent extracted oil
has low free fatty acid content.
is odourless.
has more of unsaturates.
none of these.
none of these.
Which of the following is not required in the manufacture of soda ash by Solvay process ?
Ammonia
Limestone
Nitric acid
None of these
Nitric acid
Saponification number of an oil or fat
gives an idea about its molecular weight.
is inversely proportional to its molecular weight.
detects its adulteration.
all (a), (b) & (c).
all (a), (b) & (c).
The purpose of tanning in leather industry is to
stiffen the leather.
smoothen the leather.
make it flexible.
impart water resistance.
stiffen the leather.
Lime and soda ash are added to water to remove
bicarbonates & sulphates of calcium and magnesium.
undersirable taste and odour.
bacteria.
its corrosiveness.
bicarbonates & sulphates of calcium and magnesium.
Kaoline is a/an
refractory material
synthetic resin
artificial abrasive
blue pigment
refractory material
Hydrogenation of edible vegetable oils
is an exothermic reaction.
increases their melting point.
is done in presence of nickel catalyst.
all (a), (b) and (c).
all (a), (b) and (c).
Phenol is mainly used
to produce benzene.
to produce phenol formaldehyde.
to produce polyester resin.
as a plasticiser for unsaturated polyster.
to produce phenol formaldehyde.
Main constituent of dolomite is
CaCO3
MgCO3
K2CO3
Na2CO3
MgCO3
Conversion of CO to CO2 by steam in presence of a catalyst is called
steam reforming.
shift conversion.
steam gasification.
none of these.
shift conversion.
Refractory bricks having high thermal conductivity is desirable, when it is to be used in the
L.D. converter
blast furnace
rotary kiln
recuperator
recuperator
Bromides contained in hot mother liquor is treated with __________ during manufacture of bromine from sea water.
SO3
Cl2
NH3
SO2
Cl2
Plasticisers are added to paints to
make it corrosion resistant.
make glossy surface.
give elasticity & prevent cracking of the film.
increase atmospheric oxidation.
give elasticity & prevent cracking of the film.
Resistance to fusion of the refractory under a steady rising temperature condition is called
spalling
refractoriness
both (a) & (b)
neither (a) nor (b)
refractoriness
Portland cement consists mainly of
CaO & SiO2
SiO2 & Al2O3
CaO & Al2O3
CaO & Fe2O3
CaO & SiO2
_________ glass has the lowest co-efficient of thermal expansion and hence is more heat resistant.
Pyrex
Soda lime
Lead
High silica
Pyrex
The amount of benzene present in pure benzol is about __________ percent.
30
50
70
90
70
Cumene (isopropyl benzene) is made by
oxidation of napthalene.
propylene alkylation of benzene.
polymerisation of a mixture of benzene & propylene.
none of these.
propylene alkylation of benzene.
Which of the following is not a pyrite ore?
Celestite
Galena
Gypsum
Siderite
Siderite
Mannheim furnace is used in the manufacture of
hydrochloric acid.
H2SO4 by Chamber process.
calcium carbide.
corundum.
hydrochloric acid.
Thermosetting materials:
are cross-linked molecules.
soften on application of heat.
are solvent soluble.
none of these.
are cross-linked molecules.
Pick out the wrong statement. Iodine value of an oil or fat is
the number of grams of iodine taken up by 100 gm of oil or fat.
a measure of its unsaturation.
helpful in findings its adulteration & its suitability for making soap.
independent of the type of oil, whether it is drying or non-drying.
independent of the type of oil, whether it is drying or non-drying.
Nickel is not used as a catalyst in the
Fischer-Tropsch process.
shift conversion.
hydrogenation of oil.
Ostwald’s process of HNO3 manufacture.
Ostwald’s process of HNO3 manufacture.
_________ iron is the purest form of iron.
Cast
Wrought
Pig
High silicon
Wrought
Enamels
give good glossy finish.
are same as varnish.
are prepared from non-drying oil.
do not contain pigment.
give good glossy finish.
Black liquor is converted into white liquor by
evaporation and burning the concentrate followed by causticisation of products.
multi-effect evaporation only.
selective liquid extraction.
extractive distillation.
evaporation and burning the concentrate followed by causticisation of products.
Varnish does not contain
thinner
pigment
both (a) & (b)
neither (a) nor (b)
pigment
Alcohol is produced by the
oxidation of an aldehyde
hydrolysis of an ether
esterification of a fat
none of these
hydrolysis of an ether
Varnish does not contain
pigment
thinner
dryer
anti-skimming agent
pigment
Polymerisation product of C2F4 (carbon tetraflouride) is called P.T.F.E (poly chloro tetra flouro ethylene). It is also called
polyurethane
silicone
teflon
epoxy resin
teflon
Solvent used for extraction of oil is
hexane
methyl ethyl ketone
furfurol
none of these
hexane
Insulin is an __________ drug.
anti-malarial
anti-TB
antibiotic
none of these
none of these
Liquor poisoning generally occurs due to the presence of __________ in it.
ethyl alcohol
impurities
methyl alcohol
carbonic acid
methyl alcohol
Neoprene is chemically known as
polybutadiene
styrene butadiene rubber (SBR)
polyurathane
polychloroprene
polychloroprene
Pick out the wrong statement.
Chamber process of sulphuric acid manufacture produces pure acid of concentration < 80%.
Contact process of sulphuric acid manufacture produces pure acid of concentration ≥ 98%.
75% oleum can be produced by distillation of 20% oleum.
Contact process of sulphuric acid manufacture uses nickel as the catalyst.
Contact process of sulphuric acid manufacture uses nickel as the catalyst.
Pick out the wrong statement.
Catalytic hydrogenation of carbon monoxide produces methyl alcohol.
In nylon-6, the number 6 represents the total number of carbon atoms in the ring.
Raw materials for DDT manufacture are benzene and chlorine.
Ethanolamines are produced by using ammonia and ethylene oxide as raw material.
Raw materials for DDT manufacture are benzene and chlorine.
Molecular weights of polymers are in the range of
10^2 - 10^2
10^5 - 10^9
10^2 - 10^7
10^9 - 10^11
10^2 - 10^7
Sulphur removal by heating of pyrite ore in presence of air is called its
reduction
roasting
calcination
smelting
roasting
Deacon’s method is used for the manufacture of
glauber’s salt
common salt
chlorine
graphite electrode
chlorine
Pick out the true statement pertaining to water treatment.
Slow sand filters can remove colour completely.
Activated carbon can be used for taste & odour control without subsequent filtration.
Application of activated carbon reduces the temporary hardness of water.
Normally, the turbidity is removed by adding a coagulent prior to sedimentation.
Normally, the turbidity is removed by adding a coagulent prior to sedimentation.
Laboratory glass wares which reacts with hydroflouric acid, are made of the __________ glass.
lead
borosilicate
soda lime
alkali silicate
borosilicate
Prussian blue is chemically represented by
FeO.TiO2
Ca SO4 . 2H2O
Fe4 [Fe (CN6)3]
AlF3 . 3NaF
Fe4 [Fe (CN6)3]
Transportation of 35% oleum during winter suffers from the problem of freezing, which can be overcome by the addition of small quantity of
nitric acid
hydrochloric acid
methyl alcohol
formic acid
nitric acid
The most stable allotropic form of phosphorous is the __________ phosphorous.
white
black
yellow
red
black
Function of thinner in a paint is to
accelerate the oxidation of oil.
prevent gelling of the paint.
suspend pigments & dissolve film forming materials.
form a protective film.
suspend pigments & dissolve film forming materials.
Starting material for the production of styrene butadiene rubber (SBR) is
ethyl alcohol
ethylene
both (a) & (b)
neither (a) nor (b)
both (a) & (b)
Which one of the following is not an elastomer ?
Polyisoperene
Neoprene
Nitrile-butadiene
None of these
None of these
Which of the following processes can remove both temporary as well as permanent hardness of water ?
Filtration
Boiling
Distillation
None of these
Distillation
Dacron is a
condensation product of hexam-ethylene diamine and adipic acid.
thermosetting material.
condensation product of dimethyl terephthalate and ethylene glycol.
none of these.
none of these.
Rancidity of the fatty oil can be reduced by its
decoloration
hydrogenation
oxidation
purification
hydrogenation
Platinum catalyst used in the earlier days of sulphuric acid manufacture by contact process suffers from the drawback like
high cost
fragile nature
easy poisoning tendency
all (a), (b) and (c)
all (a), (b) and (c)
_________ of rubber decreases after its vulcanisation.
Resistance to the action of organic solvent
Tackiness
Maximum service temperature
Tensile strength
Tackiness
Boiling of water containing temporary hardness produces
CO2
CaSO4
CaHCO3
none of these
CO2
Starting material for the commercial production of ethyl alcohol in India is
rice
molasses
fruit of Mahua tree
maize
molasses
Phenol formaldehyde
employs addition polymerisation.
employs condensation polymerisation.
is a monomer.
is an abrasive material.
employs condensation polymerisation.
Which of the following is not an insecticide?
Hydrocyanic acid
Nicotine
Sodium flouride
Hexane
Hexane
Shrinkage volume in cement setting does not depend upon the
sand to cement ratio.
water to cement ratio.
ambient temperature fluctuation.
drying period.
sand to cement ratio.
Bisphenol A is produced by the condensation of acetone with
formaldehyde
ethyl alcohol
diethyl ether
phenol
phenol
In Kraft process of paper manufacture, white cooking liquor consists of caustic soda
sodium sulphide & sodium carbonate.
sodium sulphite & sodium carbonate.
sodium sulphite & sodium sulphide.
none of these.
sodium sulphide & sodium carbonate.
Presence of carbonaceous matter in the sewage
causes reduction in its dissolved oxygen content thereby endangering the life of aquatic creatures.
reduces sulphate ions to sulphides causing obnoxious smell.
increases the quantity of chlorine used for its purification.
all (a), (b) and (c).
all (a), (b) and (c).
A mineral is termed as ‘ore’, if
a metal can be economically extracted from it.
it contains ≥ 40% metal.
the metal present in it is costly.
all (a), (b) and (c).
a metal can be economically extracted from it.
In the manufacture of H2SO4, vanadium catalyst as compared to platinum catalyst
gives higher conversion efficiency.
has a longer life and is not poisoned by arsenic.
handles lower SO2 content gas (7 -10% SO2), thus increasing the capital cost of the plant.
all (a), (b) and (c).
all (a), (b) and (c).
At a given temperature, the equilibrium yield of SO3 obtained from the oxidation of SO2 is proportional to (where, P = pressure of the system )
P
√P
P2
1/P
√P
Oleum produces fumes of
SO2
H2SO4
SO3
SO2 + H2SO4
SO3
20% oleum means that in 100 kg oleum, there are 20 kg of
SO3 and 80kg of H2SO4.
H2SO4 and 80kg of SO3.
SO3 for each 100 kg of H2SO4.
none of these.
SO3 and 80kg of H2SO4.
Chloramines are used in water treatment for
disinfection and control of taste & odour.
corrosion control.
removing turbidity.
control of bacteria.
disinfection and control of taste & odour.
Glycerine is recovered from lye by
evaporation followed by vacuum distillation.
liquid extraction technique.
extractive distillation technique.
none of these.
evaporation followed by vacuum distillation.
Inversion of sucrose produces
fructose
glucose
both (a) & (b)
neither (a) nor (b)
glucose
Enzymes are organic catalysts used in the __________ reactions.
chemical
biochemical
photochemical
electrochemical
biochemical
Linde process of gas liquefaction employs
exchange of heat with colder stream.
adiabatic expansion through a throttle valve (Joule-Thomson expansion).
adiabatic expansion against a piston or in a turbine.
merely compressing the gas beyond its critical pressure.
adiabatic expansion through a throttle valve (Joule-Thomson expansion).
Cellulose content of bamboo and ideal fibrous raw material for the manufacture of paper is __________ percent.
10
50
80
95
50
Ore concentration by froth floatation utilises the __________ of ore particles.
density difference
wetting characteristics
terminal velocities
none of these
wetting characteristics
The main use of activated carbon in water treatment is to control
bacterial growth
taste and odour
turbidity
none of these
taste and odour
The most commonly used substance to speed up the sedimentation of sewage is
lime
sulphuric acid
chlorine
sodium bisulphite
lime
Sucrose is a
monosacchride
disacchride
polysacchride
none of these
disacchride
Sugar content in sugarcane on cane basis is about __________ percent by weight.
1 to 5
5 to 10
15 to 20
20 to 30
5 to 10
Pick out the wrong statement.
Wine, rum & Vodka are prepared by the formulation of fruit juice, sugar beet & rye respectively.
Protein catalysts are called enzymes.
The rate of chemical reaction is independent of the concentration of reactants at high concentration of enzymes.
Total sugar content in molasses is about 10%.
Total sugar content in molasses is about 10%.
The major use of butadiene is
as a plasticiser for unsaturated polyester.
in the manufacture of synthetic rubber.
as an anti-skinning agent in paint.
none of these.
in the manufacture of synthetic rubber.
The manufacture of Kraft pulp is done by a/an __________ process.
alkaline
acidic
neutral
none of these
alkaline
Antibiotic
inhibits/destroys the growth of microorganisms.
is used as a pain reliever.
is an antimalarial.
is an anaesthetic.
inhibits/destroys the growth of microorganisms.
Which of the following paper does not require a filler during manufacture ?
Bond paper
Writing paper
Blotting paper
Coloured paper
Blotting paper
Industrial production of chloroform requires acetone and
phosgene
calcium hypochlorite
chlorine
ammonium chloride
calcium hypochlorite
Pencillin, an antibiotic drug was discovered by
Alexender
Flaming
Dr. Zivago
none of these
Alexender
Styrene (a monomer for the production of polystyrene) is commercially produced by
catalytic dehydrogenation of ethyl benzene.
dehydration of ethyl alcohol followed by hydrogenation.
reacting ethylene oxide with acetal-dehyde.
fermentation of starch.
catalytic dehydrogenation of ethyl benzene.
Hydrogenation of oil takes place in a/an __________ reactor.
autothermal
trickle bed
plug flow
none of these
trickle bed
Fatty material used in soap making is
fatty acid
fatty alcohols
tallow
detergents
tallow
__________ glass is used for the manufacture of optical glass.
Pyrex
Soda
Flint
Crooke’s
Flint
Thermosetting plastic materials
can be repeatedly melted.
is useful for melt casting.
can not be melted after forming.
is useful for spinning.
can not be melted after forming.
Favourable conditions for the liquefaction of gases in general are
high pressure & low temperature.
low pressure & high temperature.
high pressure & high temperature.
low pressure & low temperature.
high pressure & low temperature.
In the manufacture of sulphuric acid from elemental sulphur, the following sequence of major operations is followed :
furnace → converter → absorber
furnace → evaporator → absorber
furnace → converter → evaporator
converter → furnace → absorber
furnace → converter → absorber
_________ nature of hypo (sodium thiosulphate) makes it useful in photography.
Oxidising
Reducing
Complex forming
Photochemical
Complex forming
_________ is an ore of lead.
Quartz
Galena
Siderite
Chalcopyrite
Galena
Which of the following is an yellow pigment ?
Titanium dioxide
Ferrous sulphate
Lead chromates
Zinc sulphides
Lead chromates
Catalytic oxidation of toluene produces
styrene
phenol
benzene
tri-nitro-toluene
phenol
SO2 is bubbled through hot sugar cane juice to
act as an acidifying agent.
increase its concentration.
increase the amount of molasses.
increase the crystal size.
act as an acidifying agent.
The noble gas which occurs most abundantly in the atmosphere is
helium
neon
krypton
argon
argon
Main constituents of portland cement are calcium aluminate and
gypsum
silicates
sodium silicate
carbonates
silicates
Pick out the wrong statement.
High early strength cement are made from materials having high silica to lime ratio.
The function of gypsum in cement is to enhance its initial setting rate.
Acid resistant cements are known as silicate cement.
Major component of greyish portland cement is tricalcium silicate.
High early strength cement are made from materials having high silica to lime ratio.
Common salt is generally not produced commonly by __________ method from brine.
freeze drying
electrolytic
solar evaporation
vacuum evaporation
freeze drying
Which of the following is a detergent ?
Fatty alcohol
Alkyl benzene sulphonate (ABS)
Fatty acids
Methylene chloride
Alkyl benzene sulphonate (ABS)
Sulphuric acid is mainly used in the __________ industry.
fertiliser
steel
paper
paint
fertiliser
Pick out the wrong statement pertaining to nitric acid.
About 90% of nitric acid is manufactured by Ostwald’s process.
It is a strong mono basic acid which reacts with almost all the metals except noble metals.
Yellow color of impure nitric acid is because of dissolved oxides of nitrogen (mainly NO2).
Arc process of nitric acid manufacture is economical as compared to Ostwald’s process.
Arc process of nitric acid manufacture is economical as compared to Ostwald’s process.
Alcohol percentage in molasses may be around
10
40
70
85
40
Main use of hydrazine is
as a rocket fuel
in water treatment
as a disinfectant
as fire retardant
as a rocket fuel
Main use of liquid nitrogen is in
rocket propulsion.
making gun powder.
detergent manufacture.
refrigerative cooling.
refrigerative cooling.
Comparing sulphate process with sulphite process, we find that __________ in the latter.
both temperature & pressure in the former is less than that
both temperature & pressure in the former is more than that
temperature is more in the former whereas pressure is more
pressure is more in the former whereas temperature is less
both temperature & pressure in the former is more than that
Which of the following is a disaccharide ?
Sucrose
Glucose
Starch
Maltose
Sucrose
Proximate analysis of coal determines its __________ content.
moisture, ash, sulphur & volatile matter
moisture & volatile matter
moisture, sulphur, nitrogen & fixed carbon
none of these
moisture & volatile matter
Pick out the exothermic reaction out of the following:
C + H2O = CO + H2
CaC2 + H2O = Ca(OH)2 + C2H2
MgCO3 = MgO + CO2
all (a), (b) and (c)
CaC2 + H2O = Ca(OH)2 + C2H2
__________ is produced using polycondensation reaction.
Polythene
Phenol formaldehyde
Poly vinyl chloride
none of these
Phenol formaldehyde
Raw materials required for the manufacture of __________ is acetylene and hydrochloric acid.
phthalic anhydride
vinyl chloride
maleic anhydride
dacron
vinyl chloride
In industrial nomenclature, alcohol means
butyl alcohol
propyl alcohol
ethanol
methyl alcohol
ethanol
Which of the following is the purest form of water out of the following ?
Underground water
Rain water
Well water
Lake water
Rain water
Use of water having dissolved oxygen in boilers promotes
corrosion
sequestration
scale formation
none of these
corrosion
Unsaturated oils compared to saturated oils have
lower melting point & higher reactivity to oxygen.
higher melting point & higher reactivity to oxygen.
lower melting point & lower reactivity to oxygen.
higher melting point & lower reactivity to oxygen.
lower melting point & higher reactivity to oxygen.
With increase in temperature, the equilibrium constant at constant pressure (Kp) for oxidation of sulphur dioxide
increases
increases linearly
decreases
decreases linearly
decreases
Chemical formula of oleum is
H2SO3
H2SO4
H2S2O7
H2SO7
H2S2O7
Electrodeposition of metals i.e. electroplating is never done on
metals
alloys
refractories
non-metals
refractories
Hollander beater used during paper pulp manufacture does not facilitate the __________ of fibre.
cutting
fibrillation
hydration
strengthening
strengthening
The biochemical treatment applied to sewage effluents is a process of
dehydration
reduction
oxidation
polymerisation
oxidation
Ultimate analysis of coal determines its __________ content.
carbon, hydrogen, nitrogen & sulphur
carbon, ash, sulphur & nitrogen
carbon, sulphur, volatile matter & ash
carbon, volatile matter, ash & moisture
carbon, hydrogen, nitrogen & sulphur
A cane sugar factory having sugar production rate of 10 tons/day will produce about __________ tons/day of bagasse (after consumption by the factory for heating etc.).
1
10
25
40
10
Sucrose content in cane sugar may be around __________ percent.
50
70
80
95
95
Hollander beater’ machine used in the paper manufacturing plant does not accomplish the task of
final rolling out of paper.
cutting of fibres.
hydration of fibres.
fibrillation of fibre.
final rolling out of paper.
Yellow glycerine is made into white, using
activated carbon
diatomaceous earth
bauxite
bentonite
activated carbon
Very dilute solutions are generally used in fermentation reactions for which the optimum temperature range is __________ °C.
-5 to 0
5 to 10
30 to 50
75 to 80
30 to 50
Brackish water which contains mostly dissolved salt, can be purified by the __________ process.
reverse osmosis
sand filter
lime soda
permutit
reverse osmosis
Major component of flint glass is
lead oxide
silica
alumina
soda
lead oxide
Gypsum is chemically
calcium chloride
potassium sulphate
sodium sulphate
calcium sulphate
calcium sulphate
Calcination of gypsum produces
plaster of paris
salt cake
nitre cake
lime
plaster of paris
Phthalic anhydride is produced by the oxidation of
naphthalene
benzene
toluene
aniline
benzene
Superior quality laboratory apparatus is made of the __________ glass having low thermal co-efficient of expansion & high chemical resistance.
flint
soda
pyrex
potash
pyrex
Zeigler process
produces high density polyethylene.
produces low density polyethylene.
uses no catalyst.
employs very high pressure.
produces high density polyethylene.
Massecuite is
used for paper making.
used as a cattle feed.
highly acidic in nature.
none of these.
none of these.
Carbon content of pitch (residue of coal tar distillation) is around __________ percent.
70
55
80
94
94
Sodium salt of higher molecular weight fatty acid is termed as the __________ soap.
hard
soft
metallic
lubricating
soft
Synthetic glycerine is produced from
toluene
phenol
propylene
naphthalene
propylene
A ‘unit process’ is exemplified by the
distillation
hydrogenation of oils
absorption
humidification
hydrogenation of oils
Commercial scale production of hydrogen from iron-steam reaction represented by, 3Fe + 3H2O = Fe3O4 + 4H2, is not practised, as it is
a slow reaction.
a discontinuous reaction (requiring regeneration of iron by water gas intermittently).
still in development stage (by employing fluidised bed technique).
all (a), (b) and (c).
all (a), (b) and (c).
Viscosity index improver (like polystrene or polyisobutylene) is added to lubricant to
reduce its viscosity.
increase its viscosity.
reduce the variation in its viscosity with temperature.
increase the variation in its viscosity with temperature.
reduce the variation in its viscosity with temperature.
Pick out the wrong statement pertaining to solvent extraction of oil.Rate of extraction
decreases with decrease of thickness of the flakes.
increases with the increasing flake size keeping the flake thickness constant.
increases Considerably with the rise of temperature.
decreases as the moisture content of flakes increases.
decreases as the moisture content of flakes increases.
Sea weeds are an important source of
fluorine
chlorine
bromine
iodine
iodine
Polythene is a/an __________ polymerisation product.
addition
condensation
thermosetting
none of these
addition
Catalytic oxidation-dehydrogenation of methyl alcohol produces
formaldehyde
phenol
acetone
maleic anhydride
formaldehyde
In multistage equilibrium conversion of SO2 to SO3 (2SO2 + O2 2SO3), the reverse reaction becomes appreciable at a temperature of 550° C. The percentage equilibrium conversion of SO2 to SO3 can be increased by
increasing the oxygen concentration.
putting more quantity of V2O5 catalyst in the converter.
removing some quantity of SO3 during intermediate stage.
maintaining low temperature & pressure in the converter.
removing some quantity of SO3 during intermediate stage.
Tall oil obtained as a by-product from the black liquor recovery is
a black, sticky & viscous liquid.
used in the manufacture of greases, emulsions & soaps.
composed mainly of rosin & fatty acids.
all (a), (b) & (c).
all (a), (b) & (c).
__________ is a polysacchride.
Maltose
Starch
Sucrose
Glucose
Starch
Styrene is produced from ethyl benzene by the process of
dehydrogenation
oxidation
alkylation
dehydration
dehydrogenation
Acetone is produced by catalytic dehydrogenation of
phenol
naphthalene
isopropanol
ethyl benzene
isopropanol
Nitrogen is an essential component of
mineral salts
carbohydrates
fats
proteins
proteins
Bromine content in sea water may be around __________ ppm.
70
640
1875
2500
70
Argon is the third largest constituent of air (followed by N2 & O2). Its percentage by volume in air is
0.14
0.34
0.94
1.4
0.94
Poly tetraflouro ethylene (P.T.F.E.) is known as
bakelite
teflon
celluloid
decron
teflon
Bakelite is
same as poly tetrafluoroethylene (PTFE).
an inorganic polymer.
same as thermosetting phenol-formaldehyde.
not a polymer.
same as thermosetting phenol-formaldehyde.
__________ is produced by the dehydrogenation of ethyl benzene.
Styrene
Ethyl alcohol
Cumene
Phenol
Styrene
Which of the following is used as a coagulant in water treatment ?
Chloramine
Chlorine
Ferrous sulphate
Hydrogen peroxide
Ferrous sulphate
__________ paper is used in the manufacture of newsprint paper.
Groundwood
Board
Tissue
Wrapping
Groundwood
Hydrogenation of vegetable oils is a/an __________ reaction.
endothermic
autocatalytic
exothermic
homogenous
exothermic
Permanent hardness of water is due to the presence of calcium & magnesium
bi-carbonates
sulphates & chlorides
carbonate
none of these
sulphates & chlorides
Concentration of sulphide ores is done usually by
roasting
smelting
froth floatation
electro magnetic separation
froth floatation
Dacron is a/an
polyester
unsaturated polyster
polyamide
inorganic polymer
polyester
Sodium carbonate (soda ash) is not used in the manufacture of
fire extinguishers
sugar
baking powder
detergents
detergents
Viscose rayon
cannot be made from sulphite pulp.
utilises H2SO4, NaOH and CS2 during its manufacture.
cannot yield textile grade fibre.
none of these.
utilises H2SO4, NaOH and CS2 during its manufacture.
Nylon 6-6 is manufactured from
hexamethylene diamine and adipic acid.
hexamethylene diamine and maleic anhydride.
caprolactum.
dimethyl terephthalate and ethylene glycol.
hexamethylene diamine and adipic acid.
Glauber’s salt is chemically represented by
Na2SO4.10H2O
CaCl(OCl)
CaSO4.H2O
(NH4)2SO4
Na2SO4.10H2O
Chemical name of Grignard reagent is
sodium thiosulphate.
ethyl magnesium chloride.
sodium sulphite.
sodium bicarbonate.
ethyl magnesium chloride.
Which of the following processes is absent in glass manufacturing process ?
Sintering
Annealing
Shaping or forming
Melting
Sintering
Production of one ton of dry paper pulp requires about __________ tons of bamboo or wood.
1
2.5
5
10
2.5
Dacron (or terylene) fibres as compared to nylon’fibres have
better heat & acid resistant properties.
poorer resistance to alkalis.
poorer dyeability.
all (a), (b) and (c).
all (a), (b) and (c).
Grignard reagent is chemically known as
ethyl magnesium chloride.
methyl magnesium chloride.
dichlorophenol.
monochloro acetic acid.
ethyl magnesium chloride.
The function of gypsum addition during cement making is to
increase the density of cement.
decrease the cement setting rate.
both (a) and (b).
neither (a) nor (b).
decrease the cement setting rate.
Low purity oxygen is used for
L.D. steel making.
cutting and welding of metals.
medicinal purposes.
chemical oxidation processes.
chemical oxidation processes.
_________ is produced using molasses as the starting raw material.
Methyl alcohol
Ethyl alcohol
Benzol
Dimethyl ether
Ethyl alcohol
Pick out the wrong statement pertaining to the properties of glasses. Glasses generally have
high electrical insulation properties.
sharp melting points.
low co-efficient of thermal expansion.
compressive strength much greater than their tensile strengths.
sharp melting points.
A substance produced by a living organism and capable of anti-microbial activity is called a/an
antibiotic
antiseptic
disinfectant
none of these
antibiotic
Deaeration of water in its treatment is necessary, as it
minimises its turbidity.
helps in controlling its taste and odour.
minimises its corrosiveness.
none of these.
minimises its corrosiveness.
Hydrochloric acid is also known as
oil of vitriol
muriatic acid
strong organic acid
green acid
muriatic acid
Aryl benzene sulphonate (ABS) is a
detergent.
plasticiser for unsaturated polyester.
starting material for the synthesis of glycerine.
coating ingredient for photographic film.
detergent
Adipic acid is an intermediate in the manufacture of
perspex
nylon-66
polystyrene
bakelite
nylon-66
The temperature in the calcium carbide furnace is __________ °C.
200-300
700-850
2000-2200
4000-4500
2000-2200
Vinyl chloride (CH2 = CH.Cl) is produced by the thermal pyrolysis of ethylene dichloride at a pressure & temperature of
4 kgf/cm2 & 500°C.
10 kgf/cm2 & 1000°C.
40 kg/cm2 & 200°C.
100 kgi/cm2 & 500°C.
4 kgf/cm2 & 500°C.
Soaps remove dirt by
increasing the surface tension.
decreasing wettability.
supplying hydrophyllic group.
none of these.
none of these.
Which of the following additives/water proofing agents is added to lower the hydrophilic (moisture loving) characteristic of cement ?
Xanthates
Stearic acid
Calcium & aluminium stearate
Formic acid
Calcium & aluminium stearate
Chemical name of soda ash is
sodium bicarbonate
sodium thiosulphate
potassium carbonate
none of these
none of these
Out of the following processes of paper pulp manufacture, the maximum corrosion problem in digestion & handling equipments is encountered in the __________ process.
mechanical
sulphate/kraft
sulphite
neutral sulphite semi-chemical
neutral sulphite semi-chemical
__________ is used as a flux in the extraction of iron from iron ore (hametite) in blast furnace.
Bauxite
Limestone
Quartz
Manganese
Limestone
Gun powder uses
sulphur
charcoal
potassium nitrate
all (a), (b), & (c)
all (a), (b), & (c)
Dichloro diphenyl __________ is the full form of DDT (an insecticide).
tetrachloroethane
trichloroethane
tetrachloromethane
trichloromethane
trichloroethane
The basic difference between vegetable oils and fats is in their
density
chemical properties
physical state
composition
physical state
Which of the following is not a food additive?
Citric acid
Invertage
Benzoyl peroxide
Ammonium chloride
Ammonium chloride
Alum is commercially produced from
gypsum
feldspar
galena
bauxite
bauxite
CaO is called
quick lime
slaked lime
limestone
calcite
quick lime
Starting raw material for the manufacture of maleic anhydride is
n-butene
benzene
either (a) or (b)
neither (a) nor (b)
either (a) or (b)
Pick out the wrong statement.
Fibrillation of fibre during paper manufacture is done to develop the strength in paper.
Alkali consumption in digestion/cooking of bamboo is measured in terms of permangnate number.
Bagasse fibre contains both lignin & cellulose.
Presence of sodium sulphate in pulp makes the pulp bleachability poor.
Presence of sodium sulphate in pulp makes the pulp bleachability poor.
Which of the following contains least amount of N2 ?
Coke oven gas
Blast furnace gas
Producer gas
Water gas (blue gas).
Coke oven gas
Calcination of limestone is not done in a __________ kiln for producing lime.
vertical shaft
rotary
fluidised bed
fixed bed
fixed bed
Neoprene is a
monomer
synthetic rubber
polyester
none of these
synthetic rubber
Saponification value/number of an oil or fat is a measure of its
fatty acid content.
degree of unsaturation of the fatty acids present in it.
average molecular weight.
insoluble fatty acid content.
average molecular weight.
Ethyl alcohol cannot be produced
from waste sulphite substrate of paper mills.
by esterification and hydroloysis of ethylene.
from molasses.
none of these.
none of these.
Exothermic condensation reaction of monochlorobenzene with chloral in presence of 20% oleum as catalyst produces DDT. The reaction temperature is maintained at __________ °C.
15-30
90-100
250-300
<0
15-30
Cement mainly contains
CaO, SiO2, Al2O3
MgO, SiO2, K2O
Al2O3, MgO, Fe2O3
CaO, MgO, K2O
CaO, SiO2, Al2O3
Sand and __________ is fused at 1300°C, to produce sodium silicate.
limestone
soda ash
coke
sodium sulphate
soda ash
Coke used for the production of calcium carbide should have
low ash content.
low ignition temperature.
high electrical resistivity.
all (a), (b) and (c).
all (a), (b) and (c).
Sucrose is a disaccharide consisting of
glucose and glucose
glucose and fructose
glucose and galactose
fructose and galactose
glucose and fructose
Function of sodium thiosulphate (hypo) in development of photographic film/plate is to
brighten the faint images.
remove metallic silver.
convert silver chloride to silver.
remove unexposed silver halide.
remove unexposed silver halide.
High temperature carbonisation of coal takes place at __________ °C.
2000
700
1100
< 500
1100
White phosphorous is stored under water, because
it does not react with water.
it is poisonous.
its kindling temperature in dry air is very low.
it is unstable.
its kindling temperature in dry air is very low.
__________ is not a constituent of gun powder.
Carbon
Charcoal
Sulphur
Potassium nitrate
Carbon
Hydrophilic group of a soap or detergent solution is
water hating
soil loving
water loving
none of these
water loving
Rotary kiln is not involved in the production of
cement
lime from limestone
slaked lime from quick lime
none of these
slaked lime from quick lime
Mercury electrolytic cell produces 50-70% NaOH solution. Its operating temperature is __________ °C.
25
60-70
150-200
250-300
60-70
Vanillin is a type of
anti-pyretic drug
food preservative
flavour
dye
flavour
Temporary hardness of water can be removed by
addition of alum (a coagulant).
boiling.
filtration (through gravity sand filter).
addition of lime.
boiling
More than 100 percent of __________ is present in oleum.
SO3
H2SO4
H2SO3
SO2
H2SO4
Pure rectified spirit contains about __________ percent alcohol.
45
70
95
99.5
95
Oxygen is separated by distillation from air after its liquefaction. The boiling point of oxygen is about __________ °C.
-83
-183
-196
-218
-183
Titanium dioxide is a/an __________ colour pigment.
white
black
yellow
blue
white
Mercury cells for caustic soda manufacture, compared to diaphragm cells
require lower initial investment.
require more power.
produce lower concentration NaOH.
none of these.
none of these.
Cellulose percentage in bamboo fibre is about
10
20
50
85
50
Essential oils are usually obtained using
steam distillation
extractive distillation
solvent extraction
leaching
steam distillation
Impurities present in brine is normally removed by treatment with
NH3 and CO2.
lime and soda ash.
lime, ammonia and carbon.
all (a), (b) and (c).
all (a), (b) and (c).
Hydrogenation of oil/fat does not
improve its resistance to rancid oxidation.
raise its melting point.
remove double bonds.
none of these.
none of these.
Builders are added in soap to act as
cleaning power booster
anti-redeposition agent
corrosion inhibitor
fabric brightener
cleaning power booster
H2S is scrubbed from refinery gases by absorption using
dilute H2SO4
ethanol amine
chilled water
tri-butyl phosphate
ethanol amine
Chlorine gas is produced by the electrolysis of brine (NaCl solution with solid NaCl make up) in mercury electrolytic cell. Which of the following is the anodic reaction?
Oxidation of Na+ ions
Oxidation of Cl- ions
Reduction of Na+ ions
Reduction of Cl- ions
Oxidation of Cl- ions
Zeolite is a/an
naturally occuring clay which is capable of exchanging cations.
abrasive material.
catalyst used in shift conversion.
none of these.
naturally occuring clay which is capable of exchanging cations.
Type of glass used in optical work is the __________ glass.
soda-lime
fibre
lead
borosilicate
lead
Pick out the wrong statement pertaining to the soap manufacture.
Transparent soaps are made by cold process.
Organic pigments are used as colouring materials in the soap manufacture.
Both laundary as well as toilet soaps are manufactured by hot process.
Colourless rosin is used in the manufacture of laundary soaps.
Transparent soaps are made by cold process.
Ceramics are produced from silicates or clayish materials: Which of the following is not a ceramic material ?
Slag cement
Glasses
Porcelain/Potteries
Teflon
Teflon
Glass is
mainly CaO
subjected to galvanising
a super cooled liquid
all (a), (b) and (c)
a super cooled liquid
Analgesic drugs are
pain relievers
antibiotics
used in the treatment of T.B.
used in the treatment of typhiod
pain relievers
Purity of oxygen used for blowing in steel making L.D. converter is 99.5%. The boiling point of oxygen is about __________ °C.
-53
-103
-183
-196
-183
Commonly used glass is known as the __________ glass.
flint
hard
pyrex
soda
soda
Fusion of limestone and __________ produces high alumina cement.
sand
bauxite
quicklime
calcite
bauxite
Massacuits is a terminology used in the __________ industry.
paint
oil hydrogenation
soap
sugar
sugar
The basic constituent of vegetable oils is
triglyceride
fatty acids
fatty alcohol
mono esters
triglyceride
The most economical pulp for the production of newsprint would be the __________ pulp.
groundwood
sulphate
sulphite
semichemical
groundwood
Which of the following is the second major component of cement ?
Al2O3
SiO2
CaO
Fe2O3
SiO2
Mercury electrolytic cells are preferred over diaphragm electrolytic cell (for production of caustic soda), as it
has larger production capacity per unit cell.
consumes less power per ton of Cl2 produced.
produces high purity (70%) caustic soda directly.
all (a), (b) and (c).
all (a), (b) and (c).
__________ are used as corrosion inhibitor for iron & steel in aqueous solutions.
Phosphates
Chromates
Sulphates
Bi-carbonates
Chromates
L.D. converter is used in the production of
pig iron
steel
copper
zinc
steel
The terminology ‘BTX’ used in coal tar distillation industry refers to
benzol-toluol-xylol.
benzol-toluene-xylene.
benzene-toluol-xylol.
benzene-toluene-xylene.
benzene-toluene-xylene.
Which of the following is not responsible for causing permanent hardness of water ?
Ca(HCO3)2
CaCl2
MgCl2
none of these
Ca(HCO3)2
In the Solvay process, the product from the calciner is
light soda ash
dense soda ash
sodium bicarbonate
dehydrated soda ash
light soda ash
Commercially ethylene is produced from naphtha by
catalytic cracking.
catalytic dehydrogenation.
pyrolysis.
hydrocracking.
hydrocracking
Poly Vinyl Chloride (P.V.C.) is a __________ material.
thermosetting
thermoplastic
fibrous
chemically active
thermoplastic
Pig iron is produced by blast furnaces in India using mostly the iron ore named
hematite
magnetite
siderite
chalcopyrite
hematite
The difference between saponification value and acid value is:
called ester value.
always negative.
constant for all fatty oils.
none of these.
called ester value.
Fourdrinier machine is used in the manufacture of
nylon-6
paper
antibiotics
sugar
paper
Pencillin is made employing __________ fermentation process.
continuous
aerobic batch
anaerobic batch
none of these
aerobic batch
Sulphuric acid saturated with SO3 is called
concentrated H2SO4.
sulphurous acid.
oleum.
none of these.
oleum
Nylon 66 is so named because the:
average degree of polymerisation of the polymer is 1966.
number of carbon atoms between two nitrogen atoms are 6.
number of nitrogen atoms between two carbon atoms are 6
polymer was first synthesised in 1966.
average degree of polymerisation of the polymer is 1966.
Wet chlorine gas produced during electrolysis of brine is dehydrated by:
spraying 66° Be H2SO4 counter current to the flow of the gas.
passing it through a bed of diatomaceous earth.
passing it through a bed of silica gel.
none of these.
spraying 66° Be H2SO4 counter current to the flow of the gas.
CaSO4 .H2O is known as
blue vitriol
plaster of Paris
gypsum
zeolite
plaster of Paris
__________ of quicklime produces slaked lime.
Hydration
Dehydration
Hydrogenation
none of these
Hydration
Main product in calcium carbide-water reaction is
Ca(OH)2
C2H2
CO2
CaCO3
C2H2
Glauber’s salt is chemically
calcium sulphate
potassium sulphate
potassium chlorate
none of these
none of these
Which of the following fuel gases contains maximum amount of carbon monoxide ?
Coke oven gas
Water gas
Blast furnace gas
L.D. converter gas
L.D. converter gas
Baking soda is chemically represented by
Na2CO3
NaHCO3
Na2CO3.H2O
Na2CO3.10H2O
NaHCO3
P.T.F.E. (Poly tetra fluoro ethylene) is commercially known as
bakelite
neoprene
teflon
nylon-66
teflon
Which of the following is an additional step in the manufacture of paper from bagasse as compared to that from bamboo ?
Depithing
Digestion
Bleaching
None of these
Depithing
Percentage of glycerene present in the spent lye obtained during soap manufacture is about
0.5
5
20
35
5
Concentration of NaOH solution produced by diaphragm electrolytic cell is about __________ percent.
10
25
50
98
10
Commercial production of Vanaspati is done by __________ of edible vegetable oils.
hydrogenation
oxidation
hydrolysis
hydrocracking
hydrogenation
Which catalyst is used in the manufacture of ethylene oxide by oxidation of ethylene ?
AgO
Al2O3
ZnCl2
Fe2O3
AgO
Phenolic antiseptics are added in the __________ soap.
shaving
medicated
metallic
transparent
medicated
Solvay process is used for the manufacture of
caustic soda
soda ash
caustic potash
soda lime
soda ash
A mixture of chlorine & sodium bromide acts as a/an
insecticides
analgesic drug
fire retardant
hydrogenation catalyst
fire retardant
Which is a high grade pulp ?
Rag pulp
Mechanical pulp
Sulphate pulp
Sulphite pulp
Sulphate pulp
Stereospecific agents are exemplified by
radiation
supported metal oxide catalysts
ziegler catalysts
all (a), (b) & (c)
all (a), (b) & (c)
Starting material for the production of butadiene in India is
naphthalene
benzol
ethyl alcohol
phthalic anhydride
ethyl alcohol
Yellow phosphorus is transported under
air
water
nitrogen
helium
water
Permanent hardness of water can be removed by
simply boiling.
adding alum.
passing it through cation & anion exchangers.
all (a), (b) and (c).
passing it through cation & anion exchangers.
Celluloid is chemically
cellulose acetate
regenerated cellulose
cellulose nitrate
cellulose acetate butyrate
cellulose nitrate
Double Contact Double Absorption (DCDA) process is the most recent process for the manufacture of
nitric acid
sulphuric acid
ammonium sulphate
hydrochloric acid
sulphuric acid
Which of the following is an explosive ?
Nitroglycerene
Trintrotoluene (TNT)
Cellulose nitrate
All (a), (b), and (c)
All (a), (b), and (c)
Zeolite is used in the:
water treatment.
glass manufacture.
hydrogenation of fatty oil as a catalyst.
development of exposed photographic plate.
water treatment.
Thermoplastic materials
do not soften on application of heat.
are heavily branched molecules.
are solvent insoluble.
none of these.
none of these.
Carbon tetrachloride (CCl4) is the starting raw material for the manufacture of
trichloroethylene
perchloroethylene
parathion
methanol
perchloroethylene
Salt is added in the kettle during soap manufacture to separate
soap from lye.
glycerine from lye.
the metallic soap.
the unsaponified fat from soap.
soap from lye.
Manufacture of phthalic anhydride uses __________ as a catalyst.
Ni
Cr
V2O5
Al2O3
V2O5
Which of the following is not a product of coal tar distillation ?
Anthracene
Cresote oil
Carbolic oil
None of these
None of these
Teflon is:
phenol formaldehyde.
an inorganic polymer.
poly tetrafluoroethylene (P.T.F.E.).
a monomer.
poly tetrafluoroethylene (P.T.F.E.).
Chrome tanning and vegetable tanning are done for:
light & heavy leather respectively.
heavy & light leather respectively.
both light & heavy leather.
neither light nor heavy leather.
light & heavy leather respectively.
Catalyst used during the manufacture of ‘Vanaspati Ghee’ is:
zinc
nickel
platinum
copper
nickel
Iron ore hametite is concentrated using
electro magnetic separation mainly.
gravity separation.
froth floatation.
roasting.
gravity separation.
Refractory bricks burnt at very high temperature have got
greater resistance to corrosion by slags.
less resistance to corrosion by slags.
high spalling tendency.
none of these.
greater resistance to corrosion by slags.
Nitrile rubber is produced by the polymerisation of
acrylonitrile and butadiene.
acrylonitrile and styrene.
isobutylene and isoprene.
none of these.
acrylonitrile and butadiene.
Carbon disulphide is mainly used in the production of
viscose rayon.
corundum.
plasticiser for unsaturated polyester.
paints.
viscose rayon.
99.5% purity oxygen is used in
cutting and welding by oxy-acetylene flame.
hospitals for medicinal purposes.
gas masks and artificial breathing apparatus.
all (a), (b), and (c).
all (a), (b), and (c).
Nylon-6 is manufactured from
caprolactum.
hexamethylene diamine and adipic acid.
hexamethylene diamine and maleic anhydride.
hexamethylene diamine and sebacic acid.
caprolactum
Permanent hardness of water can be removed by
boiling.
adding Ca(OH)2.
boiling it with Na2CO3.
none of these.
boiling it with Na2CO3.
Sizing material is incorporated in paper to:
impart resistance to penetration by liquids.
increase its thickness.
increase its flexibility & opacity.
increase its brightness.
impart resistance to penetration by liquids.
Pick out the wrong statement.
Pasteurisation of milk involves moderate heating followed by cooling.
Bakeries and breweries make use of yeasts.
Enzyme is a complex nitrogenous compound.
Oils and fats are alkaloids.
Oils and fats are alkaloids.
Which of the following, when pyrolysed, produces perchloro-ethylene ?
Ethylene dichloride
Chlorobenzene
Carbon tetrachloride
Chlorinated paraffin
Carbon tetrachloride
Chemical name of aspirin (an analgesic drug) is
acetylsalicylic acid
nictonic acid
calcium acetate
methyl salicylate
acetylsalicylic acid
Which is the most efficient absorbant for SO3 out of the following ?
20% oleum
65% oleum
78%H2SO4
98%H2SO4
98%H2SO4
Coal tar is used as a:
binding material for coal briquettes.
fuel in rotary kiln.
binder in making carbon electrodes.
all (a), (b) and (c).
binding material for coal briquettes.
Caprolactum (a raw material for nylon-6 manufacture) is produced from
phenol
naphthalene
benzene
pyridine
benzene
The purpose of adding Na2CO3 to water of low alkalinity is to
permit the use of alum as a coagulant.
increase the softening capacity of zeolite.
facilitate easy regeneration of zeolite.
all (a), (b) and (c).
permit the use of alum as a coagulant.
Ca(OH)2 is called
quicklime
slaked lime
limestone
gypsum
slaked lime
Percentage of uranium in carnotite ore found in Jadugoda (Jharkhand) is about
0.1 to 0.5
1 to 5
5 to 10
15 to 25
0.1 to 0.5
Potassium is kept & transported under
water
liquid ammonia
kerosene oil
alcohol
kerosene oil
The metallic aluminium is obtained from pure alumina in the presence of fused cryolite by
electrolysis
electrolytic reduction
electrolytic oxidation
none of these
electrolytic reduction
Bakelite is chemically known as
polyvinyl chloride (PVC)
polybutadiene
phenol formaldehyde
polyurathane
phenol formaldehyde
Which of the following is a co-product during the manufacture of caustic soda by electrolysis of brine ?
Na2CO3
NaHCO3
H2
none of these
H2
Phthalic anhydride is made by the
oxidation of naphthalene.
oxidation of benzene.
dehydrogenation of ethyl benzene.
none of these.
oxidation of naphthalene.
RDX (an explosive), which is more sensitive but less toxic than TNT, is chemically:
cyclo trimethylene trinitramine.
trinitro resorcinol.
cyclo tetramethylene tetranitramine.
trinitro benzene.
cyclo trimethylene trinitramine.
Raw material used in alcohol distilleries is:
molasses
benzol
methylated spirit
none of these
molasses
Oil produced by solvent extraction
has low free fatty acid content.
is odourless.
both (a) &(b).
neither (a) nor (b).
neither (a) nor (b).
High acid value of an oil or fat is an indication of
storage under improper conditions.
absence of unsaturation.
its smaller molecular weight.
none of these.
storage under improper conditions.
Yeast is used in the manufacture of
pencillin
antibiotics
wine
pasteurised milk
wine
Liquefaction of gases can not be done by
exchange of heat with colder stream.
adiabatic expansion through a throttle valve (Joule-Thomson expansion).
merely compressing it beyond critical pressure.
adiabatic expansion against a piston or in a turbine.
merely compressing it beyond critical pressure.
Anion exchanger is regenerated usually with
NaOH
H2SO4
hydrazine
alum solution
NaOH
_________ is the major constituent of the Portland cement.
Calcium carbonate
Calcium oxide
Tricalcium silicate
Calcium sulphate
Tricalcium silicate
Catalytic oxidation of naphthalene produces
styrene
phenol
phthalic anhydride
none of these
phthalic anhydride
Parathion and Malathion are
pesticides.
plasticisers for unsaturated polysters.
pain-relieving drugs (analgesic).
tranquilisers.
pesticides
Transparent soaps (e.g. Pears) are:
usually soft soap (made from coconut oil) in which cane sugar & alcohol are added and finally washed with methylated spirit to achieve transparency.
metallic soaps with frothing agent and free stearic acid to achieve transparency.
metallic soaps with frothing agent from which glycerine has not been recovered.
none of these.
usually soft soap (made from coconut oil) in which cane sugar & alcohol are added and finally washed with methylated spirit to achieve transparency.
Dehydrogenation of ethyl benzene produces
styrene
naphthalene
phenol
benzoic acid
styrene
Reaction of ethylene glycol and dimethyl terephthalate (DMT) produces
nylon-6
dacron
polyester
PVC
dacron
Lindane is
not a fumigant.
BHC (Benzene Hexa Chloride) containing 99% γ-isomer.
a by-product of BHC manufacture.
both(b) and (c).
BHC (Benzene Hexa Chloride) containing 99% γ-isomer.
Solvay process is not used for the manufacture of potassium carbonate, because of the reason that potassium bicarbonate:
is prone to thermal decomposition.
has high water solubility and is unstable.
is soluble in ammonium chloride and potassium chloride solution.
all (a), (b) and (c).
is soluble in ammonium chloride and potassium chloride solution.
Which of the following is a bleaching agent added in the detergents to facilitate removal of stains caused due to blood, tea etc?
Sodium silicate
Sodium borate
Sodium tripolyphosphate (STPP)
Caustic soda
Sodium borate
In the production of soda ash by Solvay process, the by-product is
CaCl2
NH4Cl
NH3
NaOH
CaCl2
The ideal pulp for the manufacture of paper should have high __________ content.
cellulose
lignin
both (a) & (b)
none of these
cellulose
At very high concentration of enzymes, the rate of fermentation chemical reaction is __________ the concentration of reactants.
independent of
directly proportional to
inversely proportional to
proportional to the square of
independent of
Which of the following is a constituent of vinegar ?
Around 10% alcohol
Around 1% acetic acid
Both (a) and (b)
Neither (a) nor (b)
Both (a) and (b)
During the manufacture of sulphuric acid, the temperature of molten sulphur is not increased beyond 160°C, as
it is very corrosive at elevated temperature.
its viscosity is not reduced on further heating (hence pressure drop on pumping it, cannot be further reduced).
it decomposes on further increasing the temperature.
none of these.
its viscosity is not reduced on further heating (hence pressure drop on pumping it, cannot be further reduced).
Kopper-Totzek coal gasifier
can give ammonia:
synthesis gas (H2 + N2).
is a moving bed reactor.
cannot use coking coal.
operate at very high pressure.
can give ammonia synthesis gas (H2 + N2).
Addition of calcium oxide to water produces
exothermic heat
hissing sound
slaked lime
all (a), (b) & (c)
all (a), (b) & (c)
Sodium bisulphite is used for __________ water.
deaeration
dechlorination
both (a) & (b)
neither (a) nor(b)
both (a) & (b)
Riboflavin is a/an
vitamin
analgesic drug
anaesthetics
anti-malarial drug
vitamin
Flash point of most vegetable oils is about __________ °C.
50
100
200
300
200
Presence of sodium tripolyphosphate (an additive) in synthetic detergent:
facilitates its use even in hard water (by sequestering the water-hardening Ca & Mg ions).
inhibits its corrosive effects.
does not allow redeposition of dirt on the cleaned surface.
none of these.
facilitates its use even in hard water (by sequestering the water-hardening Ca & Mg ions).
Dense soda ash used in the manufacture of glass, is chemically represented by
Na2CO3
Na2CO3.10H2O
Na2CO3.H2O
Na2HCO3
Na2CO3.H2O
Reverse osmosis is normally used for the:
separation of isotopes of uranium from gaseous uranium hexaflouride.
separation of helium from natural gas.
desalination of brackish water to produce potable (drinking) water.
purification of oxygen.
desalination of brackish water to produce potable (drinking) water.
Hydrazine is largely used
as a starting material for ‘hypo’.
in photographic industry.
as rocket fuel.
in printing industry.
in printing industry.
‘Synthesis gas’ meant for the synthesis of organic compound is a variable mixture of
N2 & H2
CO2 & H2
CO & H2
C & H2
CO & H2
Litharge is
lead oxide
zinc oxide
zinc sulphide
cellulosic photographic material
lead oxide
Coagulant is used __________ filtration.
before
after
during
to avoid
before
10% oleum comprises of 10% free
SO2
H2SO3
SO3
H2SO4
SO3
Use of chlorine in the treatment of sewage:
helps in grease separation.
increases the biological oxygen demand(BOD).
causes bulking of activated sludge.
aids in flocculation.
helps in grease separation.
Removal of dirt/soil by soaps or detergent does not involve the __________ of soil.
emulsification
dispersion
precipitation
wetting
precipitation
A unit operation is exemplified by the process of
reduction
desorption
nitration
combustion
desorption
The major constituents of glass are
lime, clay and soda ash
sand, lime and soda ash
silica, alumina and clay
silica, alumina and soda ash
sand, lime and soda ash
Margarine is a/an
fat
explosive
plasticiser
rocket propellant
fat
Oils and fats are converted to soap in a process called
hydrogenation
esterification
saponification
none of these
saponification
Glycerine can be obtained from
fat
naphthalene
cumene
sucrose
fat
Blue vitriol is chemically
copper sulphate
ferrous sulphate
copper nitrate
aluminium sulphate
copper sulphate
Trinitro-toluene (TNT) is
used in glycerine manufacture.
an explosive.
used in dye manufacture.
none of these.
an explosive.
Thorium is mainly used
for the manufacture of gas mantles.
as a fissile fuel in a nuclear reactor.
in the manufacture of hydrogen bomb.
in the treatment of cancer.
for the manufacture of gas mantles.
During the absorption of HCl gas in water (to produce liquid HCl), the gas is kept above dew point to:
increase the rate of absorption.
avoid corrosion.
reduce the cooling water circulation rate.
none of these.
avoid corrosion.
Good quality of edible salt is obtained from brine by the process of
solar evaporation
vacuum evaporation
freeze drying
electrolysis
vacuum evaporation
Electric bulbs are made of __________ glass.
jena
flint
crookes
pyrex
flint
Which of the following is used as a binding material in soap to improve soap texture ?
Rosin
Borax
Benzyl acetate
Sodium carbonate
Borax
An alkali metal salt of palmitic acid is known as
soap
metallic soap
detergent
alkaloid
metallic soap
Washing soda is chemically represented by
Na2CO3
Na2CO3.H2O
Na2CO3.10H2O
NaHCO3
Na2CO3.10H2O
Magnesium and calcium __________ cause temporary hardness of water.
carbonates
bicarbonates
phosphates
sulphates
bicarbonates
Which form of sulphur is the most stable at room temperature ?
Plastic
Monoclinic
Rhombic
Flowers of sulphur
Rhombic
Vegetable oils and fats basically differ in their
density ranges
physical state
chemical composition
chemical properties
physical state
Average sulphur content in Indian pyrites is about __________ percent.
15
35
55
70
35
Oil is a/an
mixture of glycerides.
mixture of glycerides of fatty acids.
solid at normal temperature.
ester of alcohols other than glycerine.
mixture of glycerides of fatty acids.
Which of the following is a constituent of coffee ?
Caffeine
Nicotine
Calgon
Lignin
Caffeine
Which of the following is the main constituent of the mother liquor produced in salt industry ?
Quick lime
Glauber’s salt
Salt petre
Bromine
Bromine
Silicon carbide is a/an
adhesive
abrasive
type of glass
brittle material
abrasive
Oxygen is produced by fractionation of air using __________ process.
Linde’s
Claude’s
either (a) or (b)
none of these
either (a) or (b)
Trinitrotoluene (TNT), an explosive, is made by the nitration of
nitrobenzene
toluene
nitrotoluene
benzene
toluene
Which of the following is used as a coagulant in treating turbid water ?
Chlorine
Ferric sulphate
Calcium sulphate
Activated carbon
Ferric sulphate
Carborundum consists mainly of
bauxite
silicon carbide
boron carbide
calcium carbide
silicon carbide
Wax is a:
mixture of glycerides.
mixture of esters of polyhydric alcohols excepting glycerine.
liquid at room temperature.
mixture of glycerides of fatty acids.
mixture of esters of polyhydric alcohols excepting glycerine.
Catalyst used in the hydrogenation of oil is
nickel
platinum
iron
alumina
nickel
Viscose rayon is
cellulose nitrate.
regenerated cellulose nitrate.
regenerated cellulose acetate.
none of these.
none of these.
Triple superphosphate is manufactured by reacting
phosphate rock with phosphoric acid.
phosphate rock with sulphuric acid.
phosphate rock with nitric acid.
ammonium phosphate with phosphoric acid.
phosphate rock with phosphoric acid.
Use of hydrated lime in water treatment
before filtration, reduces the bacterial load on filters.
after filtration, combats the corrosive-ness of water due to the presence of O2 & CO2.
is to adjust the pH value.
all (a), (b) and (c).
all (a), (b) and (c).
Higher vicosity index of a lubricating oil denotes
less changes in fluidity of oil with temperature.
substantially high change in fluidity of oil with temperature.
its unsuitability under varying temperature conditions .
none of these.
less changes in fluidity of oil with temperature.
Le-Blanc process is a primitive process for the manufacture of
caustic soda
soda ash
bromine from sea water
hydrochloric acid
soda ash
How much temperature is maintained during quicklime manufacture in the calcination zone of the vertical shaft kiln?
500°C
750°C
1000°C
1500°C
1000°C
Cement setting under water employs a/an __________ process.
hydration
decomposition
oxidation
reduction
hydration
__________ are added in lacquers to remove film brittleness and to improve adhereness.
Film forming materials
Plasticisers
Diluents
Solvents
Plasticisers
Systemic insecticides
are absorbed throughout the plant.
kill insects following external bodily contact.
are stomach poisons.
emit poisonous vapour.
are absorbed throughout the plant.
Dry ice (solidified CO2) is used for the:
storage & shipment of frozen foods and ice-creams.
liquefaction of permanent gases.
liquefaction of natural gas.
none of these.
storage & shipment of frozen foods and ice-creams.
In nylon-66, the first and second numbers (i.e., 6) respectively designate the number of carbon atoms present in the
diamine and the ring.
dibasic acid and the ring.
diamine and the dibasic acid.
none of these.
diamine and the dibasic acid.
Chemical formula of BHC, which is an insecticide is
C6H6Cl6
C6Cl6
C6H5Cl
C6H4Cl2
C6H6Cl6
A bio-catalyst produced by living cells which acts independent of the cell is called a/an
substrate
enzyme
nutrient
none of these
enzyme
Pick out the wrong statement.
DDT is manufactured by the condensation of chlorobenzene with chloral at 30°C in presence of oleum, which is a highly exothermic reaction.
Chloral is obtained by the chlorination of ethyl alcohol.
Insecticides acting on the insects through the respiratory system are called fumigants.
Benzene hexachloride is not a contact insecticide.
Benzene hexachloride is not a contact insecticide.
The product obtained on mixing calcium oxide with water is called
quicklime
slaked lime
milk of lime
none of these
slaked lime
The major constituent of black liquor generated during paper manufacture is sodium
sulphate
carbonate
hydroxide
bi-carbonate
carbonate
Exothermic neutralisation reaction between caustic soda and dodecylbenzene sulphonic acid produces sodium dodecylbenzene sulphate, which is a/an
explosive
soap
detergent
analgesic drug
detergent
Conversion of SO2 to SO3 in Monsanto 4-pass converter is about __________ percent.
80
90
98
100
98
Coke oven gas consists mainly of
H2, & CH4
CO, & CO2
H2, & CO
CH4, & CO
H2, & CH4
Chemical name of ‘alum’ is
barium sulphate.
aluminium sulphate.
aluminium chloride.
calcium sulphate.
aluminium sulphate.
Lithopane is
explosive
white lead
filter aid
ZnS (white pigment)
ZnS (white pigment)
What products do we get on electrolysis of saturated brine using steel cathode and graphite anode in an electrolytic cell ?
Cl2 & Na
Cl2 & H2
O2 & H2
Cl2, H2 & NaOH solution.
Cl2, H2 & NaOH solution.
__________ acid is the main constituent of cotton seed oil.
Acetic
Linoleic
Palmitic
Oleic
Linoleic
Chemical formula of ‘salt cake’ is
Na2SO4
CaSO4
MgSO4
BaSO4
Na2SO4
Temperature during hydrogenation of oil should not be more than 200°C, otherwise it will result in
pyrolysis of oil.
sintering of porous catalyst.
hydrogen embrittlement.
all (a), (b) and (c).
all (a), (b) and (c).
Nicotine is
a volatile alkaloid.
obtained by treating by-products of the tobacco processing industry.
both (a) and (b).
neither (a) nor (b).
both (a) and (b).
Separation of fresh water from sea water can be done by the __________ operation.
osmosis
reverse osmosis
absorption
adsorption
reverse osmosis
Na2CO3.10H2O is called
washing soda
soda ash
slaked lime
quicklime
washing soda
Reaction of an alcohol with organic acid is called the __________ reaction.
saponification
esterification
neutralisation
acidification
esterification
Ethanol amine is produced using ammonia and
ethyl benzene
ethylene oxide
ethanol
ethane
ethylene oxide
__________ acid is an unsaturated fatty acid.
Palmitic
Oleic
Stearic
Oxalic
Oleic
CO & H2 are the constituents of
producer gas
water gas
coke oven gas
all (a), (b) and (c)
all (a), (b) and (c)
Economics of ‘Solvay Process’ depends upon the efficiency of:
carbonating tower
ammonia recovery
ammonia recovery and size of the plant
ammoniation of salt solution
ammonia recovery and size of the plant
_________ is a thermosetting plastic.
Polyvinyl chloride
Polythene
Bakelite
Teflon
Bakelite
Na2CO3 is called
washing soda
soda ash
plaster of paris
calcite
soda ash
Flux addition during smelting of ore is done to:
remove impurities/gangue.
enhance rate of reaction.
accelerate reduction of ore.
separate slag from metal.
remove impurities/gangue.
Hydrazine is used in water treatment for the removal of:
colloidal impurities
dissolved oxygen
turbidity
chlorinous taste
dissolved oxygen
Direct conversion of chemical energy into electrical energy is done in a
magnetohydrodynamic (MHD) generator.
fuel cell.
fast breeder reactor.
none of these.
fuel cell.
Which of the following is not produced commercially from sea water ?
Magnesium & potassium compounds
Common salt
Bromine
Iodine
Iodine
Pick out the wrong statement.
Dry process is used for the manufacture of cement, when the raw material is blast furnace slag.
Portland cement is made employing wet process.
Gypsum is added to portland cement to lengthen its setting time.
none of these.
none of these.
Nylon-6 as compared to Nylon-66 is having higher
hardness
abrasion/resistance
melting point
none of these
none of these
Digestion of wood-base materials (for manufacture of pulp) is done to
remove lignin.
produce long fibres.
prevent deterioration on storage.
none of these.
remove lignin.
Soap cannot be used with hard water, because
hard water contains sulphate.
they form insoluble calcium soaps which precipitate.
they attract back the removed dirt.
none of these.
they form insoluble calcium soaps which precipitate.
Which of the following is not an antibiotic ?
Penicillin
Streptomycin
Tetracyclin
Quinine
Quinine
The most reactive allotropic form of phosphorus is __________ phosphorus.
red
yellow
violet
black
yellow
Plasticisers are added to synthetic plastics to
impart flexibility.
improve workability during fabrication.
develop new improved properties not present in the original resins.
all (a), (b) and (c).
all (a), (b) and (c).
Rosin soap is added during paper manufacture to
impart adhesive properties.
improve opacity.
impart resistance to penetration by liquids.
none of these.
impart resistance to penetration by liquids.
Hydrogen gas is not produced commercially (for nitrogeneous fertiliser manufacture) by
iron-steam reaction.
electrolysis of water.
steam reforming of naphtha.
its cryogenic separation from coke oven gas.
iron-steam reaction.
Carboxymethyl cellulose (CMC) is added in detergents to
prevent redeposition of soil on cleaned surface.
act as optical brightening agent.
inhibit corrosion in washing machines made of aluminium,
none of these.
prevent redeposition of soil on cleaned surface.
Synthesis gas is a mixture of
CO and H2
N2 and H2
H2, CH4 and CO
CO2 and H2
CO and H2
Which of the following impurities in feed water for high pressure boiler is the most detrimental ?
Silica
Dissolved oxygen
Suspended salt
Dissolved salt
Silica
Which glass is usually used in optical work?
Lead glass
High silica (borosilicate) glass
Photo-sensitive glass
Fibre glass
Lead glass
Fourdrinier machine is used in the manufacture of
sugar
paper
alcohol from molasses
phenol formaldehyde
paper
The most popular and common detergent i.e., alkyl benzene sulfonate (ABS) is a/an __________ detergent.
cationic
anionic
amphoteric
semi polar
anionic
Reaction of calcium carbide with water produces a gas, which is used
as an illuminant.
for metal cutting/welding.
both (a) & (b).
neither (a) nor (b).
both (a) & (b).
Salt is the basic raw material for the manufacture of
cement
glass
potteries
caustic soda
caustic soda
Pick out the wrong statement.
Low intensity explosives are also called propellants, whereas high intensity explosive are called detonators.
Gun powder comprises of 75% salt petre, 15% charcoal and 10% sulphur.
Lead azide is a popular military explosive.
TNT is a hygroscopic explosive having very high melting point and is non-toxic to human being.
TNT is a hygroscopic explosive having very high melting point and is non-toxic to human being.
Hydrazine (N2H4) is used mainly as a/an
explosive
rocket fuel
detergents additive
none of these
rocket fuel
Hydrocynic acid (HCN) is used as an insecticide for
controlling timber degradation by ants
controlling poultry lice
potato beetle
citrus fruits
citrus fruits
Molecular weight of plastics ranges from
5000 to 10000
20000 to 250000
500 to 5000
106 to l09
20000 to 250000
Acrylonitrile is mainly used in the __________ industry.
polymer
printing
dyeing
photographic
dyeing
The enzyme which converts starch into the disacharides maltose is
diastase
maltase
yeast
none of these
diastase
Pick out the false statement pertaining to water treatment.
Aeration of water is effective in CO2 removal.
The zeolite water softening process reduces the hardness of water by not more than 50%.
Sodium sulphate or sodium carbonate do not cause hardness in water.
Water with pH value less than 7, is acidic.
The zeolite water softening process reduces the hardness of water by not more than 50%.
Presence of H2S in raw water (to be chlorinated) results in the
reduced softening capacity of zeolite.
increased dosage of chlorine to provide a disinfecting residual in the water.
easy removal of its hardness.
none of these.
increased dosage of chlorine to provide a disinfecting residual in the water.
Contact process of sulphuric acid manufacture
yields acid of higher concentration than chamber process.
yields acids of lower concentration than chamber process.
is obsolete.
eliminates absorber.
yields acid of higher concentration than chamber process.
Fat dispersed in water is exemplified by
colloids
gel
butter
emulsion
butter
Maleic anhydride is produced by catalytic oxidation of
toluene
ethyl alcohol
naphthalene
benzene
benzene
Catalyst used in the oxidation of benzene to produce maleic anhydride is
V2O5
Pt
Ni
Cr
V2O5
Widely used method for the conditioning of boiler feed water is the
cold lime process
coagulation
hot-lime soda process
sequestration
hot-lime soda process
Blue colour is imparted to glass by the addition of
FeSO4
PbO
CaO
NaOH
CaO
In the manufacture of viscose rayon, the raw material used industrially is
recalyptious wood
bamboo
bagasse
fine teak wood
fine teak wood
Bordeaux mixture is a/an
fertiliser
inorganic fungicide
insecticide
explosive
inorganic fungicide
Silicone is a/an
thermoplastic
inorganic polymer
monomer
none of these
inorganic polymer
Nickel is not used as a catalyst in the __________ reaction.
shift conversion
oil hydrogenation
steaming reforming of naphtha
ammonia cracking/dissociation
shift conversion
Roasting of metallurgical ores is done mainly to
dehydrate it.
sinter the ore.
remove CO2 & H2O.
remove arsenic & sulphur.
remove arsenic & sulphur.
Molasses is the starting material for the production of
alcohol
essential oil
fatty acids
massecuite
alcohol
BHC (Benzene hexachloride) is made by the chlorination of benzene
which is an addition reaction.
which is a substitution reaction.
in absolute dark.
in presence of sunlight.
which is an addition reaction.
Diaphragm electrolytic cell as compared to mercury electrolytic cell
produces 70% NaOH solution.
requires less specific power consumption for the production of chlorine.
requires lesser investment for similar capacity.
all (a), (b) and (c).
requires lesser investment for similar capacity.
Calcareous & argillaceous materials are used in the manufacture of
lead
cement
carbon disulphide
none of these
cement
Pick out the wrong statement.
Azoic dyes are mostly applied on cotton fabrics.
Basic dyes (e.g. amino derivatives) are applied mostly to paper.
Mordant dyes are applied mainly to wools.
none of these.
none of these.
Commercial production of calcium carbide requires limestone and __________ as raw materials.
coke
sand
soda ash
fuel oil
coke
Which one of the following is not likely to be a constituent of vegetable oils ?
Citric acid
Oleic acid
Stearic acid
Glycerol
Citric acid
Nitroglycerene absorbed in wood flour, sodium nitrate or ammonium nitrate is commercially used as a controlled explosive called dynamite. The raw material used for its manufacture are glycerene, nitric acid and _____.
sulphuric acid
phosphoric acid
hydrochloric acid
hydroflouric acid
sulphuric acid
The process involved in converting rubber into a thin sheet or coating it on fabric is called
extrusion
mastication
calendering
valcanisation
calendering
Air used in aerobic fermentation must be sterilized, otherwise the
recovery of product will be difficult.
contamination of pure culture would result.
uniformity of product cannot be achieved.
none of these.
contamination of pure culture would result.
Alkylbenzene sulfonate (ABS) is a
detergent
rubber
pesticide
polyester
detergent
High temperature carbonisation of coal produces
inferior coke compared to low temperature carbonisation.
less of gases compared to liquid products.
larger quantity of tar compared to low temperature carbonisation.
none of these.
none of these.
Alcohol content in freshly prepared natural and fortified wine may be respectively around __________ percent.
7-14 and 14-30
7-14 and 40-50
14 - 30 and 40-50
10 - 20 and 40 - 50
7-14 and 14-30
Setting of plaster of paris is accompanied with
hydration
dehydration
hydrolysis
loss of CO2
hydration
Process conditions in fermentator used for production of penicillin is
25°C, 2 atm.
50°C, l0 atm.
30°C, 200 mm Hg (absolute).
90°C, 45 atm.
25°C, 2 atm.
Platinum is a versatile catalyst for many processes in chemical industries. It is highly prone to be poisoned by the presence of
carbon
arsenic
lead
sulphur
arsenic
Sodium chloride content in sea water is about __________ gms/litre.
2
10
25
50
25
Fluorescent dyes are added in detergents to
act as fabric brightener (by converting ultraviolet light to visible light) thereby improving the whiteness appearance of white fabrics.
attain distinctiveness from other brands.
act as tarnish inhibitor for metals like German silver.
none of these
act as fabric brightener (by converting ultraviolet light to visible light) thereby improving the whiteness appearance of white fabrics.
High magnesia lime is added to hot sugar cane juice (during the manufacture of sugar) to
flocculate the impurities.
facilitate fast filtration.
both (a) and (b).
neither (a) nor (b).
both (a) and (b).
Polyvinyl chloride (PVC) is
a thermosetting material.
a condensation polymerisation product.
made by employing emulsion polymerisation.
none of these.
made by employing emulsion polymerisation.
Bleaching of paper pulp is done with
activated clay
bromine
chlorine or chlorine dioxide
magnesium sulphite
chlorine or chlorine dioxide
Pick out the wrong statement.
Kraft method of pulp manufacture can process all types of fibrous raw materials.
Digestion time for bagasse is less than that for wood base materials.
Both temperature and pressure in the digestor is less in case of the sulphite method as compared to that in the sulphate method.
none of these.
none of these.
Isopropyl benzene produced by alkylation of benzene with propylene is known as
neoprene
cumene
gelatin
mercaptans
cumene
Consider the production of ammonia from methene and air as raw materials. The catalyst used are: (i) __________ for steam reforming of methane and (ii) __________ for ammonia synthesis.
i - Ni/Al2O3; ii - Cu - ZnO/Al2O3
i - Fe/Al2O3; ii - Cu - ZnO/Al2O3
i - Ni/Al2O3; ii - Fe/Al2O3
i - Fe/Al2O3; ii - Ni/Al2O3
i - Ni/Al2O3; ii - Fe/Al2O3
For the hydrogenation of oils __________ (A) __________ is commonly used as catalyst and __________ (B) __________ is a catalyst poison.
(A) platinum (B) sulphur
(A) palladium (B) oxygen
(A) nickel (B) sulphur
(A) nickel (B) oxygen
(A) nickel (B) sulphur
Main constituents of natural rubber is
polystyrene
polyisoprene
polybutadiene
polychloroprene
polyisoprene
Highly porous refractory bricks are
less susceptible to chemical attack by molten fluxes and gases etc.
very strong.
having very high thermal conductivity.
none of these.
none of these.
Fumigant insecticides
kill insects, when they eat it.
emit poisonous vapour.
are absorbed throughout the plant.
none of these.
emit poisonous vapour.
Fermentator temperature during production of alcohol from molasses is around __________ °C.
5
30
150
300
30
Which of the following coals has the highest calorific value ?
Lignite
Sub-bituminous
Anthracite
Peat
Anthracite
Which of the following is not an abrasive material ?
Bakelite
Pumice
Corundum
Carborundum
Bakelite
Pick out the wrong statement.
Hard glass which is used for making laboratory glass wares is a mixture of sodium borosilicate and aluminium borosilicate.
Glass is decolorised during its manufac-ture by adding antimony oxide, mangnese dioxide or arsenic oxide.
Ordinary glass is represented chemically by Na2O . CaO . 6SiO2.
Red color is imparted to glass by addition of arsenic oxide.
Red color is imparted to glass by addition of arsenic oxide.
Finely ground calcium aluminate & silicate is a/an
cermet
cement
abrasive
explosive
cement
Cooking liquor in case of sulphite process is
sodium sulphite and sodium bisulphite.
magnesium sulphite and free SO2 in acid medium.
magnesium sulphate and magnessium bicarbonate.
none of these.
sodium sulphite and sodium bisulphite.
90% of the caprolactum is converted to nylon-6 on its condensation polymerisation in the reactor maintained at __________ °C.
<0
10-30
250-280
500-600
10-30
Vegetable oils contain large quantity of glycerides of unsaturated acids. When the vegetable oils contain high amount of saturated fatty acids, it is termed as __________ oil.
drying
semi-drying
non-drying
none of these
non-drying
Fats as compared to oils have
more unsaturated glycerides of fatty acids.
less unsaturated glycerides of fatty acids.
much higher reactivity to oxygen.
lower melting point.
less unsaturated glycerides of fatty acids.
Thermal pyrolysis of ethylene dichloride produces
trichloroethylene
vinyl chloride
ethanol amine
ethylene oxide
vinyl chloride
The main component of pyrex glass is
zinc
lead
boron
celenium
lead
Alum [Al2(SO4)3] is used as a coagulant in water treatment to remove
colour
turbidity
bacteria
all (a), (b) and (c)
all (a), (b) and (c)
__________ is an ore concentrating metallurgical process involving a chemical change.
Electromagnetic separation
Froth floatation
Roasting
none of these
Roasting
Basic oxide is absent in __________ glass.
flint
pyrex
quartz
all (a), (b) & (c)
quartz
Nylon-6 is a
polyamide
thermosetting resin
polyester
none of these
polyamide
Enzymes are
proteins with high molecular weight (around 10, 000).
derived from living organisms.
catalyst for temperature sensitive reactions.
all (a), (b) and (c).
all (a), (b) and (c).
Multistage catalytic converter is not used in the
conversion of SO2 to SO3
NH3 synthesis reaction.
both (a) & (b).
neither (a) nor (b).
NH3 synthesis reaction.
The main product of high temperature carbonisation of coal is
coke
ammonia
tar
phenol
coke
_________ is a thermosetting plastic.
Polythene
Epoxy polymer
P.V.C.
Polystyrene
Epoxy polymer
In an integrated steel plant, NH3 present in coke oven gas is normally recovered as
(NH4)2SO4
NH4Cl
(NH4)2 NO3
liquid NH3
(NH4)2SO4
Flexible foam (for mattresses) is usually made of
PVC
silicone
polyurethanes
polyamides
polyurethanes
Glycerine is a by-product of the __________ industry.
soap
detergent
oil hydrogenation
paint
soap
One of the steps during refining of cane sugar consists of addition of hydrated lime to the sugar syrup followed by carbonation of the resulting solution. The purpose of this step is to
adjust the pH of the syrup.
remove the coloring matter from the syrup.
reduce the viscosity of the syrup.
improve the rate of crystallisation of sugar.
adjust the pH of the syrup.
Permanent hardness of water can be removed by
addition of soda ash to it.
treating it with zeolites.
passing it through sodium hexametaphosphate.
all (a), (b), and (c).
all (a), (b), and (c).
Chalcopyrite is the main ore of
copper
lead
tin
iron
copper
The end bleaching agent used to move last traces of colour bodies from the pulp is
chlorine dioxide (ClO2)
MgO
SO2 gas
mercaptans
chlorine dioxide (ClO2)
Bio-degradable detergents ______.
can be readily oxidised.
pose problem in sewerage plant.
have an isoparaffinic structure.
should not be used as it spoils the cloth.
can be readily oxidised.
Sea water contains about __________ ppm of bromine.
5
70
500
1700
70
Which allotrope of sulphur is insoluble in carbon disulphide ?
Rhombic sulphur
Monoclinic sulphur
Plastic sulphur
Milk of sulphur
Plastic sulphur
Lubricating greases are a mixture of
mineral oil, soap and additives.
mineral oil and metallic soap.
mineral oil and fatty oil.
fatty oil and metallic soap.
mineral oil, soap and additives.
Metallic soap is __________ salt of fatty acids.
sodium
potassium
both sodium & potassium
aluminium or calcium
aluminium or calcium
Cation exchanger is regenerated usually with
NaOH
H2SO4
hydrazine
alum solution
H2SO4
In contact process, SO3 is absorbed in 97% H2SO4 and not in water, because ____.
SO3 gas is sparingly soluble in water.
water forms an acid mist, which is difficult to absorb.
the purity of acid is affected.
scale formation in the absorber is to be avoided.
water forms an acid mist, which is difficult to absorb.
Bitterns is a/an ______.
unsaturated fat.
starting material for the production of iodine.
by-product of chlor-alkali industry.
none of these.
none of these.
Bitterns are concentrated brine that remains after the crystallization of salt from seawater.
The most widely used coagulant for removing suspended impurities from water is
bleaching powder
chlorine
calcium sulphate
alum
alum
Main constituent of limestone is
CaCO3
MgCO3
Na2CO3
CaSO4
CaCO3
__________ is obtained as a by-product in the manufacture of sodium hydroxide using brine.
Chlorine
Ammonium chloride
Sodium carbonate
Sodium bi-carbonate
Chlorine
Fat splitting catalyst is
CaCO3
ZnO
Al2O3
Fe
ZnO
Phthalic anhydride is used
in making PVC
as plasticisers
in insecticides manufacture
for making nylon-6
as plasticisers
Penicillin is separated from fermented broth by
extraction with amyl or butyl acetate.
ternery azeotropic distillation.
evaporation in calendria.
extractive distillation.
extraction with amyl or butyl acetate.
__________ process is used for producing soda ash.
Chamber
Chance
Tromp
Solvay
Solvay
Bleaching powder (chemically known as calcium chloro hypochlorite) is commercially produced by the action of chlorine on
slaked lime
soda lime
calcium perchlorate
none of these
slaked lime
Which of the following is an unsaturated fatty acid ?
Lauric acid
Palmitic acid
Stearic acid
Oleic acid
Oleic acid
The yield of tar from high temperature carbonisation of dry coal is about __________ percent.
3
12
22
0.3
3
__________ is used as a flux in the smelting of copper ore like chalcopyrite.
Coke breeze
Lime powder
Silica/quartz
Dolomite
Silica/quartz
Phenol formaldehyde is produced by condensation polymerisation. It is also known as ______.
teflon
bakelite
polyester
nylon-66
bakelite
Hydrogenation of oil does not
remove double bonds.
raise its melting point.
improve its resistance to oxidation.
none of these.
none of these.
Main constituents of cotton fiber is
lignin
cellulose
starch
gelatine
cellulose
CaCl(OCl) is the chemical formula of
hypo
bleaching powder
plaster of paris
aqua regia
bleaching powder
Which is the most suitable dye for synthetic fibres ?
Acid dye
Azoic dye
Pigment dye
Mordant dye
Acid dye
Pick out the wrong statement.
Cold rubber (SBR) is superior as compared to hot rubber (SBR).
Polymerisation temperature can modify the properties of SBR.
Production of cold SBR employs lower pressure as compared to that of hot SBR.
none of these.
none of these.
Pick out the wrong statement.
Strongly caking coal should not be used in the Lurgi gasifier.
Acetylene gas can not be used for illumination purpose.
Water gas is called blue gas because of the color of the flame, when it is burnt.
Gaseous fuels require less percentage of excess air for combustion as compared to liquid fuels.
Acetylene gas can not be used for illumination purpose.
Hydrolysis of sugar is called
hydration
inversion
esterification
none of these
inversion
Sulphuric acid completely saturated with sulphur trioxide is called
concentrated sulphuric acid.
oleum.
sulphurous acid.
dilute sulphuric acid.
concentrated sulphuric acid.
Fish contains about __________ percent oil.
5
10
20
35
20
The main aim behind cooling the digested chip at the bottom portion of the digestor by injecting cold black liquor is to
avoid mechanical weakening of fibre.
remove lignin by way of crystallisation.
increase the cellulose content.
none of these.
avoid mechanical weakening of fibre.
Polymethyl methacrylate (PMMA) is known as
bakelite
teflon
perspex
nylon-6
perspex
Coloured glass is obtained by mixing of colored salts. Addition of __________ oxide is done to impart greenish blue color to the glass.
chromium
arsenic
copper
mangnese
copper
Percentage of alcohol in beer may be around __________ percent.
2-8
18-23
27-32
1-4
2-8
Which of the following is an ore of iron ?
Galena
Chalcopyrite
Hematite
Bauxite
Hematite
Which of the following may be viewed as a catalyst in the manufacture of soda ash by Solvay process ?
NH3
NaCl
CaO
Coke
NH3
High purity nitrogen is used in
making protective gas (95% N2 + 5% H2) for annealing of cold rolled steel strip coils.
fire fighting purposes.
both (a) & (b).
neither (a) nor (b).
both (a) & (b).
Commercial production of soda ash by Solvay process requires limestone, __________ as raw materials.
coke and sand
brine and coal
coke and caustic soda
none of these
brine and coal
Naphthalene is removed from coke oven gas by
adsorbing on palladium.
absorbing in ethanolamine.
scrubbing with wash oil.
passing it through electrostatic precipitator.
scrubbing with wash oil.
The compressive strength of cement should not be less than about 110Kg/cm2 after three days & not less than 170Kg/cm2 after seven days. The fineness of an ordinary cement as determined by turbidimetric method should be about __________ cm2/gm.
800
1600
4000
8500
1600
Which of the following is not present in bagasse fibre ?
Cellulose
Lignin
Pentogens
None of these
None of these
Nitric acid is not used in the manufacture of
detergents
fertilisers
aqua regia
explosives.
detergents
Naphthols are derivates of
methyl amine
naphthalene
phenol
xylene
naphthalene
Fermentation is adversely affected by the
presence of air.
absence of air.
high concentration.
presence of ammonium salts.
high concentration.
High concentration cause osmotic stress + inhibits enzyme action.
Extraction of __________ employs an electrolytic process.
aluminium
silver
copper
all (a), (b) and (c)
Aluminium
Aluminum can only be extracted through hall-heroult process (electrolytic) while others offer a variety of methods.
Dechlorination of treated water is necessary to
remove residual turbidity.
reduce the bacterial load on filter.
control taste and odour.
remove chlorinous taste.
remove chlorinous taste.
Fire clay is __________ refractory material.
a basic
an acidic
a neutral
not a
an acidic
Fire Clay is composed of SiO2 and Al2O3 which are acidic oxides.
An oil is converted into fat by its
hydrogenation
hydrolysis
hydrocracking
hydration
hydrogenation
Production of one ton of cement requires about __________ tons of limestone.
0.6
1.2
2.2
3.8
1.2
Low temperature carbonisation of coal takes place at __________ °C.
300
1100
700
900
700
Shaving soaps are
soft potassium soaps (potassium salt of fatty acid) with free stearic acid to give lather a lasting property.
metalic soaps compounded with frothing agents.
high free alkali soaps having excess of cane sugar and alcohol.
none of these
soft potassium soaps (potassium salt of fatty acid) with free stearic acid to give lather a lasting property.
