chem process (sec 6-9) Flashcards
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
removing some quantity of SO3 during intermediate stage.
Tall oil obtained as a by-product from the black liquor recovery is
all (a), (b) & (c).
__________ is a polysacchride.
Starch
Styrene is produced from ethyl benzene by the process of
dehydrogenation
Acetone is produced by catalytic dehydrogenation of
isopropanol
Nitrogen is an essential component of
proteins
Bromine content in sea water may be around __________ ppm.
70
Argon is the third largest constituent of air (followed by N2 & O2). Its percentage by volume in air is
0.94
Poly tetraflouro ethylene (P.T.F.E.) is known as
teflon
Bakelite is
same as thermosetting phenol-formaldehyde.
__________ is produced by the dehydrogenation of ethyl benzene.
Styrene
Which of the following is used as a coagulant in water treatment ?
Ferrous sulphate
__________ paper is used in the manufacture of newsprint paper.
Groundwood
Hydrodenation of vegetable oils is a/an __________ reaction.
exothermic
Permanent hardness of water is due to the presence of calcium & magnesium
sulphates & chlorides
Concentration of sulphide ores is done usually by
froth floatation
Dacron is a/an
polyester
Sodium carbonate (soda ash) is not used in the manufacture of
detergents
Viscose rayon
utilises H2SO4, NaOH and CS2 during its manufacture.
Nylon 6-6 is manufactured from
hexamethylene diamine and adipic acid.
Glauber’s salt is chemically represented by
Na2SO4.10H2O
Chemical name of Grignard reagent is
ethyl magnesium chloride.
Which of the following processes is absent in glass manufacturing process
Sintering
Production of one ton of dry paper pulp requires about __________ tons of bamboo or wood.
2.5
Dacron (or terylene) fibres as compared to nylon’fibres have
all (a), (b) and (c).
better heat & acid resistant properties.
poorer resistance to alkalis.
poorer dyeability.
The function of gypsum addition during cement making is to
decrease the cement setting rate.
Low purity oxygen is used for
chemical oxidation processes.
__________ is produced using molasses as the starting raw material.
Ethyl alcohol
Pick out the wrong statement pertaining to the properties of glasses. Glasses generally have
sharp melting points.
A substance produced by a living organism and capable of anti-microbial activity is called a/an
antibiotic
Deaeration of water in its treatment is necessary, as it
minimises its corrosiveness.
Hydrochloric acid is also known as
muriatic acid
Adipic acid is an intermediate in the manufacture of
nylon-66
The temperature in the calcium carbide furnace is __________ °C.
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.
Soaps remove dirt by
none of these.
increasing the surface tension.
decreasing wettability.
supplying hydrophyllic group.
Which of the following additives/water proofing agents is added to lower the hydrophilic (moisture loving) characteristic of cement ?
Calcium & aluminium stearate
Chemical name of soda ash is
none of these
sodium bicarbonate
sodium thiosulphate
potassium carbonate
Out of the following processes of paper pulp manufacture, the maximum corrosion problem in digestion & handling equipments is encountered in the __________ process.
neutral sulphite semi-chemical
__________ is used as a flux in the extraction of iron from iron ore (hametite) in blast furnace.
Limestone
Gun powder uses
all (a), (b), & (c)
sulphur
charcoal
potassium nitrate
Dichloro diphenyl __________ is the full form of DDT (an insecticide).
trichloroethane
The basic difference between vegetable oils and fats is in their
physical state
Which of the following is not a food additive?
Ammonium chloride
Alum is commercially produced from
bauxite
CaO is called
quick lime
Starting raw material for the manufacture of maleic anhydride is
either (a) or (b)
n-butene
benzene
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
Calcination of limestone is not done in a __________ kiln for producing lime.
fixed bed
Neoprene is a
synthetic rubber
Saponification value/number of an oil or fat is a measure of its
average molecular weight.
Ethyl alcohol cannot be produced
none of these.
from waste sulphite substrate of paper mills.
by esterification and hydroloysis of ethylene.
from molasses.
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
Cement mainly contains
CaO, SiO2, Al2O3
Sand and __________ is fused at 1300°C, to produce sodium silicate.
soda ash
Coke used for the production of calcium carbide should have
all (a), (b) and (c).
low ash content.
low ignition temperature.
high electrical resistivity.
Sucrose is a disaccharide consisting of
glucose and fructose
Function of sodium thiosulphate (hypo) in development of photographic film/plate is to
remove unexposed silver halide.
High temperature carbonisation of coal takes place at __________ °C
1100
White phosphorous is stored under water, because
its kindling temperature in dry air is very low.
_________ is not a constituent of gun powder.
Carbon
Hydrophilic group of a soap or detergent solution is
water loving
Rotary kiln is not involved in the production of
slaked lime from quick lime
Mercury electrolytic cell produces 50-70% NaOH solution. Its operating temperature is __________ °C.
60-70
Vanillin is a type of
flavour
Temporary hardness of water can be removed by
boiling.
More than 100 percent of __________ is present in oleum.
H2SO4
Pure rectified spirit contains about __________ percent alcohol.
95
Oxygen is separated by distillation from air after its liquefaction. The boiling point of oxygen is about __________ °C.
-183
Titanium dioxide is a/an __________ colour pigment.
white
Mercury cells for caustic soda manufacture, compared to diaphragm cells
none of these.
require lower initial investment.
require more power.
produce lower concentration NaOH.
Cellulose percentage in bamboo fibre is about
50
Essential oils are usually obtained using
steam distillation
Impurities present in brine is normally removed by treatment with
all (a), (b) and (c).
NH3 and CO2.
lime and soda ash.
lime, ammonia and carbon.
Hydrogenation of oil/fat does not
none of these.
improve its resistance to rancid oxidation.
raise its melting point.
remove double bonds.
Solvay process as compared to dual process (i.e. modified Solvay process)
both (b) and (c).
has less corrosion problems.
involves higher investment in NH3 recovery units than that for crystallisation units for NH4Cl.
Builders are added in soap to act as
cleaning power booster
H2S is scrubbed from refinery gases by absorption using
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 Cl- ions
Zeolite is a/an
naturally occuring clay which is capable of exchanging cations.
Type of glass used in optical work is the __________ glass.
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 ?
Teflon
Glass is
a super cooled liquid
Analgesic drugs are
pain relievers
Commonly used glass is known as the __________ glass.
soda
fusion of limestone and __________ produces high alumina cement.
bauxite
Massacuits is a terminology used in the __________ industry.
sugar
The basic constituent of vegetable oils is
triglyceride
The most economical pulp for the production of newsprint would be the __________ pulp.
groundwood
Which of the following is the second major component of cement ?
SiO2
Mercury electrolytic cells are preferred over diaphragm electrolytic cell (for production of caustic soda), as it
all (a), (b) and (c).
has larger production capacity per unit cell.
consumes less power per ton of Cl2 produced.
produces high purity (70%) caustic soda directly.
are used as corrosion inhibitor for iron & steel in aqueous solutions.
Chromates
L.D. converter is used in the production of
steel
The terminology ‘BTX’ used in coal tar distillation industry refers to
benzene-toluene-xylene.
Which of the following is not responsible for causing permanent hardness of water ?
Ca(HCO3)2
In the Solvay process, the product from the calciner is
light soda ash
Commercially ethylene is produced from naphtha by
hydrocracking.
Poly Vinyl Chloride (P.V.C.) is a __________ material.
thermoplastic
Pig iron is produced by blast furnaces in India using mostly the iron ore named
hematite
The difference between saponification value and acid value is
called ester value.
Fourdrinier machine is used in the manufacture of
paper
Pencillin is made employing __________ fermentation process.
aerobic batch
Sulphuric acid saturated with SO3 is called
oleum.
Nylon 66 is so named because the
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.
CaSO4 1/2.H2O is known as
plaster of Paris
__________ of quicklime produces slaked lime.
Hydration
Main product in calcium carbide-water reaction is
C2H2
Glauber’s salt is chemically
none of these
calcium sulphate
potassium sulphate
potassium chlorate
Which of the following fuel gases contains maximum amount of carbon monoxide ?
L.D. converter gas
Baking soda is chemically represented by
NaHCO3
Which of the following is an additional step in the manufacture of paper from bagasse as compared to that from bamboo ?
Depithing
Percentage of glycerene present in the spent lye obtained during soap manufacture is about
5
Concentration of NaOH solution produced by diaphragm electrolytic cell is about __________ percent.
10
Commercial production of Vanaspati is done by __________ of edible vegetable oils.
hydrogenation
Which catalyst is used in the manufacture of ethylene oxide by oxidation of ethylene ?
AgO
Phenolic antiseptics are added in the __________ soap.
medicated
Solvay process is used for the manufacture of
soda ash
A mixture of chlorine & sodium bromide acts as a/an
fire retardant
Which is a high grade pulp ?
Sulphate pulp
Stereospecific agents are exemplified by
all (a), (b) & (c)
radiation
supported metal oxide catalysts
ziegler catalysts
Starting material for the production of butadiene in India is
ethyl alcohol
Yellow phosphorus is transported under
water
Permanent hardness of water can be removed by
passing it through cation & anion exchangers.
Celluloid is chemically
cellulose nitrate
Double Contact Double Absorption (DCDA) process is the most recent process for the manufacture of
sulphuric acid
Which of the following is an explosive ?
All (a), (b), and (c)
Nitroglycerene
Trintrotoluene (TNT)
Cellulose nitrate
Zeolite is used in the
water treatment.
Thermoplastic materials
are heavily branched molecules.
Carbon tetrachloride (CCl4) is the starting raw material for the manufacture of
perchloroethylene
Salt is added in the kettle during soap manufacture to separate
soap from lye.
Manufacture of phthalic anhydride uses __________ as a catalyst.
V2O5
Which of the following is not a product of coal tar distillation ?
None of these
Anthracene
Cresote oil
Carbolic oil
Chrome tanning and vegetable tanning are done for
light & heavy leather respectively.
Catalyst used during the manufacture of ‘Vanaspati Ghee’ is
nickel
Iron ore hametite is concentrated using
gravity separation.
Refractory bricks burnt at very high temperature have got
greater resistance to corrosion by slags.
Nitrile rubber is produced by the polymerisation of
acrylonitrile and butadiene.
Carbon disulphide is mainly used in the production of
viscose rayon.
99.5% purity oxygen is used in
all (a), (b), and (c).
cutting and welding by oxy-acetylene flame.
hospitals for medicinal purposes.
gas masks and artificial breathing apparatus.
Nylon-6 is manufactured from
caprolactum.
Permanent hardness of water can be removed by
boiling it with Na2CO3
Sizing material is incorporated in paper to
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 ?
Carbon tetrachloride
Chemical name of aspirin (an analgesic drug) is
acetylsalicylic acid
Which is the most efficient absorbant for SO3 out of the following ?
98%H2SO4
Coal tar is used as a
all (a), (b) and (c).
binding material for coal briquettes.
fuel in rotary kiln.
binder in making carbon electrodes.
Caprolactum (a raw material for nylon-6 manufacture) is produced from
benzene
The purpose of adding Na2CO3 to water of low alkalinity is to
permit the use of alum as a coagulant.
Ca(OH)2 is called
slaked lime
Percentage of uranium in carnotite ore found in Jadugoda (Jharkhand) is about
0.1 to 0.5
Potassium is kept & transported under
kerosene oil
The metallic aluminium is obtained from pure alumina in the presence of fused cryolite by
electrolytic reduction
Bakelite is chemically known as
phenol formaldehyde
Which of the following is a co-product during the manufacture of caustic soda by electrolysis of brine ?
H2
Phthalic anhydride is made by the
oxidation of naphthalene.
RDX (an explosive), which is more sensitive but less toxic than TNT, is chemically
cyclo trimethylene trinitramine.
Raw material used in alcohol distilleries in India is
molasses
Oil produced by solvent extraction
neither (a) nor (b).
has low free fatty acid content.
is odourless.
High acid value of an oil or fat is an indication of
storage under improper conditions.
Yeast is used in the manufacture of
wine
Liquefaction of gases can not be done by
merely compressing it beyond critical pressure.
Anion exchanger is regenerated usually with
NaOH
__________ is the major constituent of the Portland cement.
Tricalcium silicate
Catalytic oxidation of naphthalene produces
phthalic anhydride
Parathion and Malathion are
.
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.
Dehydrogenation of ethyl benzene produces
styrene
Reaction of ethylene glycol and dimethyl terephthalate (DMT) produces
dacron
Lindane is
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 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 borate
In the production of soda ash by Solvay process, the by-product is
CaCl2
At very high concentration of enzymes, the rate of fermentation chemical reaction is __________ the concentration of reactants.
independent of
Which of the following is a constituent of vinegar ?
Both (a) and (b)
Around 10% alcohol
Around 1% acetic acid
During the manufacture of sulphuric acid, the temperature of molten sulphur is not increased beyond 160°C, as
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).
Addition of calcium oxide to water produces
all (a), (b) & (c)
exothermic heat
hissing sound
slaked lime
Sodium bisulphite is used for __________ water.
both (a) & (b)
deaeration
dechlorination
Riboflavin is a/an
vitamin
Flash point of most vegetable oils is about __________ °C.
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).
.
Dense soda ash used in the manufacture of glass, is chemically represented by
Na2CO3.H2O
Reverse osmosis is normally used for the
desalination of brackish water to produce potable (drinking) water.
‘Synthesis gas’ meant for the synthesis of organic compound is a variable mixture of
CO & H2
Litharge is
lead oxide
Coagulant is used __________ filtration.
before
10% oleum comprises of 10% free
SO3
Use of chlorine in the treatment of sewage
helps in grease separation.
Removal of dirt/soil by soaps or detergent does not involve the __________ of soil.
precipitation
