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ChELE 2024 > IBX - CPI Sec. 1 to 3 > Flashcards

IBX - CPI Sec. 1 to 3 Flashcards

IndiaBIX - Chemical Process (Sections 1 to 3)

1
Q

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.

A

low temperature and high pressure.

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2
Q

Gun powder, which is an explosive comprises of charcoal, sulphur and

glycerene
salt petre
nitro glycerene
dynamite

A

salt petre

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3
Q

Starting raw material for the manufacture of alum is

alumina
gypsum
bauxite
ammonium bicarbonate

A

bauxite

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4
Q

Salt cake is chemically represented by

Na2SO4
CaSO4.H2O
MgSO4
BaSO4

A

Na2SO4

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5
Q

Which of the following sugars is the sweetest?

Glucose
Fructose
Sucrose
Lactose

A

Fructose

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6
Q

Paper pulp produced by kraft/sulphate process is

bleached easily
dull white in color
strong fibrous
dark colored

A

strong fibrous

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7
Q

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.

A

adiabatic expansion against a piston or in a turbine.

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8
Q

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.

A

drilling of petroleum wells and pickling of steel sheets.

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9
Q

The gasification reaction represented by, C + H2O = CO + H2, is a/an __________ reaction.

exothermic
endothermic
catalytic
autocatalytic

A

endothermic

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10
Q

Viscose rayon is chemically

cellulose nitrate
regenerated cellulose nitrate
cellulose acetate
regenerated cellulose acetate

A

regenerated cellulose acetate

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11
Q

All enzymes are made of

fats
carbohydrates
proteins
amino acids

A

proteins

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12
Q

The combustion reaction, C + O2 = CO2, is

exothermic
endothermic
autocatalytic
none of these

A

exothermic

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13
Q

Styrene is produced from ethyl benzene by the process of

dehydrogenation
oxidation
alkylation
dehydration

A

dehydrogenation

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14
Q

Gelatine which is a nitrogenous organic protein is obtained by the hydrolysis of

callagen
tannin
molasses
carbohydrate

A

callagen

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15
Q

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.

A

none of these.

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16
Q

Sucrose content in the raw juice extracted from sugar cane is about __________ percent.

1 - 2
15 - 20
50 - 60
80 - 85

A

15 - 20

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17
Q

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.

A

mixture of higher molecular weight alcohols (a by-product obtained during production of alcohol from molasses).

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18
Q

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).

A

all (a), (b) and (c).

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19
Q

Co-efficient of thermal expansion of glass is decreased by the addition of __________ during its manufacture.

CaO
MnO2
ZnO
FeS

A

ZnO

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20
Q

The catalyst used in the manufacture of DDT (from chloral and chlorobenzene) is

dilute H2SO4
oleum
ultraviolet light
none of these

A

oleum

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21
Q

Haemoglobin is a/an

amino acid
biological catalyst
protein
enezyme

A

protein

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22
Q

Epoxy resin

is a good adhesive.
is an elastomer.
cannot be used for surface coatings.
is a polyester.

A

is a good adhesive.

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23
Q

Concentration of NaOH solution produced by mercury electrolytic cell is about __________ percent.

10
25
50
98

A

50

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24
Q

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.

A

Pollution of water stream by mercury.

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25
Q

Esterification reaction produces

detergent
vanaspati
soap
mercaptans

A

soap

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26
Q

Wood charcoal is used for decolouration of sugar, because it __________ the coloured materials.

adsorbs
oxidises
reduces
converts

A

adsorbs

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27
Q

Producer gas consists mainly of

CO, CO2 N2, H2
CO, H2
H2, CH4
C2H2, CO2, H2

A

CO, CO2 N2, H2

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28
Q

Neoprene is the trade name of

polyurathane
phenol formaldehyde
polychloroprene
styrene-butadiene rubber

A

polychloroprene

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29
Q

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).

A

is not unfit for drinking purpose.

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30
Q

Which of the following is an organo-metal-lic compound?

Isopropyl alcohol
Tetra-ethyl lead
Zeolite
Cumene

A

Tetra-ethyl lead

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31
Q

Sulphur addition in soap is done to

improve the soap texture.
cure pimples & dandruff.
fasten lather formation.
increase its cleansing action.

A

cure pimples & dandruff.

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32
Q

Phosphate rock is a raw material for the manufacture of

phosphoric acid
phosphorous
superphosphates
all (a), (b) and (c)

A

all (a), (b) and (c)

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33
Q

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).

A

all (a), (b) and (c).

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34
Q

Which of the following is not a raw material used for the manufacture of ordinary glass?

Iron oxide
Soda ash
Limestone
Silica

A

Iron oxide

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35
Q

Esterification reaction

produces soap.
is reversible.
is a reaction between an alcohol and an organic acid.
all (a), (b) and (c).

A

all (a), (b) and (c).

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36
Q

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

A

10 atm., 170-180°C

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37
Q

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.

A

sodium chloride

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38
Q

Pick out the endothermic reaction out of the following.

C+O2 = CO
CO + 3H2 = CH4 + H2O
CaCO3 = CaO + CO2
CO +O2 = CO2

A

CaCO3 = CaO + CO2

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39
Q

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.

A

killing of organisms present in it by heating it at controlled temperature without changing its natural characteristics.

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40
Q

Fusion of bauxite and __________ produces high alumina cement.

alum
limestone
coke
quartz

A

limestone

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41
Q

__________ process is used for the manufacture of sodium carbonate by ammonia soda process.

Ostwald’s
Bosch
Solvay
Haber’s

A

Solvay

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42
Q

Polycaprolactum is commercially known as

nylon-6
nylon-66
dacron
rayon

A

nylon-6

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43
Q

Frasch process is for

making oxygen
producing helium
mining sulphur
making nitrogen

A

mining sulphur

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44
Q

Very fine suspended and colloidal impurities are removed from water by a process called

sedimentation
coagulation
disinfection
softening

A

coagulation

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45
Q

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).

A

it reduces viscosity and imparts fluidity for its transportation through pipelines at economic pressure drop.

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46
Q

Which is the main reducing agent during production of iron from iron ore in a blast furnace?

C
CO
CO2
H2

A

CO

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47
Q

The drug used in contraceptives is

sulphadizene
mestranol
methyl salicylate
pencillin

A

mestranol

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48
Q

Raw materials used for producing __________ cement does not contain iron oxide.

waterproof
slag
white
pozzolan

A

white

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49
Q

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.

A

large quantity of coal can be processed.

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50
Q

Neon gas is

flammable in nature.
used in color discharge tube.
filled in lamps having tungsten filament.
all (a), (b) and (c).

A

used in color discharge tube.

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51
Q

Calgon used in water treatment is chemically

sodium phosphate
sodium hexametaphosphate
calcium phosphate
tricresyl phosphate

A

sodium hexametaphosphate

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52
Q

Which oil is preferred for paint manufacture?

Drying oil
Non-drying oil
Semi-drying oil
Saturated oil

A

Drying oil

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53
Q

Styrene butadiene rubber (SBR) is

a natural rubber.
a synthetic polymer.
a synthetic monomer.
another name of silicone rubber.

A

a synthetic polymer.

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54
Q

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

A

5 atm & 275°C

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55
Q

Glycerine is not used in the

manufacture of explosive.
conditioning and humidification of tobacco.
manufacture of pharmaceuticals.
none of these.

A

none of these.

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56
Q

Cumene is the starting material for the production of

benzoic acid
phenol and acetone
isoprene
styrene

A

phenol and acetone

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57
Q

The type of high refractive index glass used in optical instruments is __________ glass.

pyrex
flint
crookes
none of these

A

flint

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58
Q

Oxidation of ortho-xylene in presence of __________ catalyst is done to produce phthalic anhydride on commercial scale.

nickel
vanadium
alumina
iron

A

vanadium

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59
Q

Most commonly used rubber vulcanising agent is

sulphur
bromine
platinum
alumina

A

sulphur

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60
Q

Terylene is

same as dacron
a polyester
both (a) & (b)
neither (a) nor(b)

A

both (a) & (b)

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61
Q

Free alkali in a toilet soap is __________ that in a laundary shop.
less than
more than
same

none of these

A

less than

62
Q

Dehydrogenation of isopropanol produces

propyl alcohol
acetone
trichloroethylene
formaldehyde

A

acetone

63
Q

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.

A

Tarnish inhibitor (e.g., benzotriazole) is added in soap to facilitate the removal of stains due to tea, blood etc.

64
Q

Concentration of hydrogen peroxide is done by

crystallisation
vacuum crystallisation
atmospheric distillation
dehydration

A

vacuum crystallisation

65
Q

Helium is produced on commercial scale from

air
natural gas
coke oven gas
none of these

A

natural gas

66
Q

Fermentation of molasses to produce ethyl alcohol is done at __________ °C

20 - 30
< - 5
100 - 150
250 - 300

A

20 - 30

67
Q

The catalyst used in the manufacture of DDT is

alumina.
silica.
20% oleum.
aluminium chloride.

A

20% oleum.

68
Q

Most widely and commonly used coagulant for the removal of suspended impurities in water is

bleaching powder
slaked lime
alum
copper sulphate

A

alum

69
Q

__________ is used as a catalyst in fat splitting.

ZnO
Ni
V2O5
FeO

A

ZnO

70
Q

Which of the following is not produced on commercial scale from sea water?

Bromine.
Magnesium compounds.
Potassium compounds.
Sodium sulphate.

A

Sodium sulphate.

71
Q

Heating of __________ to 120°C, produces plaster of paris.

blue vitriol
gypsum
calcium silicate
calcium sulphate

A

gypsum

72
Q

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.

A

Decomposition of sulphuric acid on heating does not start before its boiling.

73
Q

Which of the following has sodium bicarbonate as its main constituent ?

Baking soda
Baking powder
Washing soda
none of these

A

Baking powder

74
Q

Ordinary glass is not a/an

amorphous isotropic material.
supercooled liquid.
material with sharp definite melting point.
electrical insulator.

A

material with sharp definite melting point.

75
Q

In premitive days, __________ was being manufactured by Leblanc Process.

alum
washing soda
soda ash
calcium carbide

A

soda ash

76
Q

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).

A

SASOL (in South Africa).

77
Q

Lurgi coal gasifier is a pressurised __________ bed reactor.

moving
fixed
fluidised
entrained

A

moving

78
Q

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.

A

cause cholesterol build up and blood clotting.

79
Q

Paper grade bamboo contains about __________ percent cellulose.

5
20
40
60

A

5

80
Q

Carboxymethyl cellulose (CMC) is added in detergents to act as a/an

surfactant
builder
optical brightening agent
anti soil redeposition agent

A

anti soil redeposition agent

81
Q

Vulcanisation of rubber

decreases its tensile strength.
increases its ozone & oxygen reactivity.
increases its oil & solvent resistance.
converts its plasticity into elasticity.

A

converts its plasticity into elasticity.

82
Q

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.

A

salt, limestone and coke or gas.

83
Q

Chloral is used in the manufacture of

DDT
BHC
parathion
none of these

A

DDT

84
Q

Bromine is used in the preparation of

fire extinguishing compounds.
fire proofing agents.
dyes and antiknock compounds.
all (a), (b) and (c).

A

all (a), (b) and (c).

85
Q

Sudden temperature fluctuation does not affect pyrex glass, because of its

low co-efficient of expansion.
high co-efficient of expansion.
high melting point.
both (b) and (c).

A

low co-efficient of expansion.

86
Q

The process used for the manufacture of ethyl alcohol from molasses is

distillation
dehydration
dehydrogenation
none of these

A

none of these

87
Q

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

A

< 10

88
Q

Absorption of SO3 in 97% H2SO4 is

exothermic
endothermic
not possible
none of these

A

exothermic

89
Q

__________ process is used for the commercial production of nitric acid by the catalytic oxidation of ammonia.

Solvay
Ostwald’s
Haber’s
none of these

A

Ostwald’s

90
Q

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

A

car battery solution

91
Q

The catalyst used in the production of elemental sulphur from H2S (by oxidation-reduction) is

alumina
silica gel
platinum
nickel

A

alumina

92
Q

A good quality coal should have

low fusion point of ash
high ash content
high sulphur content
none of these

A

none of these

93
Q

Zeolite used in water softening process (cation exchange) is regenerated by washing with

brine
chloramines
sodium bisulphite
liquid chlorines

A

brine

94
Q

The catalyst used in shift converter is

nickel
vanadium
silica gel
alumina

A

nickel

95
Q

Which of the following is a detergent ?

Benzene hexachloride
Alkyl benzene sulphonate
Polytetraflouroethylene
Cellulose nitrate

A

Alkyl benzene sulphonate

96
Q

Drinking (potable) water treatment does not involve

coagulation
sedimentation
softening
disinfection

A

softening

97
Q

Phenol formaldehyde resin is used as an adhesive in making

laminates
card boxes
furniture
books

A

laminates

98
Q

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.

A

All vegetable oils except coconut oil, contains fatty acids having more than sixteen carbon atoms.

99
Q

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.

A

avoid its decomposition.

100
Q

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.

A

oxides of nitrogen & V2O5 on a porous carrier.

101
Q

DDT stands for

diethyl-diphenyl-trichloromethane.
dichloro-diphenyl-trichloromethane.
diphenyl-dichloro-trichloromethane.
dichloro-diphenyl-trichloroethane.

A

dichloro-diphenyl-trichloroethane.

102
Q

Phosphoric acid is prepared from

cryolite
chalcopyrite
rock phosphate
none of these

A

rock phosphate

103
Q

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.

A

as a lubricant.

104
Q

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

A

Lime-soda process

105
Q

Bleaching action of bleaching powder is due to its __________ properties.

reducing
oxidising
disinfecting
none of these

A

oxidising

106
Q

Solvent extracted oil

has low free fatty acid content.
is odourless.
has more of unsaturates.
none of these.

A

none of these.

107
Q

Which of the following is not required in the manufacture of soda ash by Solvay process ?

Ammonia
Limestone
Nitric acid
None of these

A

Nitric acid

108
Q

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).

A

all (a), (b) & (c).

109
Q

The purpose of tanning in leather industry is to

stiffen the leather.
smoothen the leather.
make it flexible.
impart water resistance.

A

stiffen the leather.

110
Q

Lime and soda ash are added to water to remove
bicarbonates & sulphates of calcium and magnesium.
undersirable taste and odour.
bacteria.
its corrosiveness.

A

bicarbonates & sulphates of calcium and magnesium.

111
Q

Kaoline is a/an

refractory material
synthetic resin
artificial abrasive
blue pigment

A

refractory material

112
Q

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).

A

all (a), (b) and (c).

113
Q

Phenol is mainly used

to produce benzene.
to produce phenol formaldehyde.
to produce polyester resin.
as a plasticiser for unsaturated polyster.

A

to produce phenol formaldehyde.

114
Q

Main constituent of dolomite is

CaCO3
MgCO3
K2CO3
Na2CO3

A

MgCO3

115
Q

Conversion of CO to CO2 by steam in presence of a catalyst is called

steam reforming.
shift conversion.
steam gasification.
none of these.

A

shift conversion.

116
Q

Refractory bricks having high thermal conductivity is desirable, when it is to be used in the

L.D. converter
blast furnace
rotary kiln
recuperator

A

recuperator

117
Q

Bromides contained in hot mother liquor is treated with __________ during manufacture of bromine from sea water.

SO3
Cl2
NH3
SO2

A

Cl2

118
Q

Plasticisers are added to paints to

make it corrosion resistant.
make glossy surface.
give elasticity & prevent cracking of the film.
increase atmospheric oxidation.

A

give elasticity & prevent cracking of the film.

119
Q

Resistance to fusion of the refractory under a steady rising temperature condition is called

spalling
refractoriness
both (a) & (b)
neither (a) nor (b)

A

refractoriness

120
Q

Portland cement consists mainly of

CaO & SiO2
SiO2 & Al2O3
CaO & Al2O3
CaO & Fe2O3

A

CaO & SiO2

121
Q

__________ glass has the lowest co-efficient of thermal expansion and hence is more heat resistant.

Pyrex
Soda lime
Lead
High silica

A

Pyrex

122
Q

The amount of benzene present in pure benzol is about __________ percent.

30
50
70
90

A

70

123
Q

Cumene (isopropyl benzene) is made by

oxidation of napthalene.
propylene alkylation of benzene.
polymerisation of a mixture of benzene & propylene.
none of these.

A

propylene alkylation of benzene.

124
Q

Which of the following is not a pyrite ore?

Celestite
Galena
Gypsum
Siderite

A

Siderite

125
Q

Mannheim furnace is used in the manufacture of

hydrochloric acid.
H2SO4 by Chamber process.
calcium carbide.
corundum.

A

hydrochloric acid.

126
Q

Thermosetting materials

are cross-linked molecules.
soften on application of heat.
are solvent soluble.
none of these.

A

are cross-linked molecules.

127
Q

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.

A

independent of the type of oil, whether it is drying or non-drying.

128
Q

Nickel is not used as a catalyst in the

Fischer-Tropsch process.
shift conversion.
hydrogenation of oil.
Ostwald’s process of HNO3 manufacture.

A

Ostwald’s process of HNO3 manufacture.

129
Q

__________ iron is the purest form of iron.

Cast
Wrought
Pig
High silicon

A

Wrought

130
Q

Enamels

give good glossy finish.
are same as varnish.
are prepared from non-drying oil.
do not contain pigment.

A

give good glossy finish.

131
Q

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.

A

evaporation and burning the concentrate followed by causticisation of products.

132
Q

Varnish does not contain

thinner
pigment
both (a) & (b)
neither (a) nor (b)

A

pigment

133
Q

Alcohol is produced by the

oxidation of an aldehyde
hydrolysis of an ether
esterification of a fat
none of these

A

hydrolysis of an ether

134
Q

Varnish does not contain

pigment
thinner
dryer
anti-skimming agent

A

pigment

135
Q

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

A

teflon

136
Q

Solvent used for extraction of oil is

hexane
methyl ethyl ketone
furfurol
none of these

A

hexane

137
Q

Insulin is an __________ drug.

anti-malarial
anti-TB
antibiotic
none of these

A

none of these

138
Q

Liquor poisoning generally occurs due to the presence of __________ in it.

ethyl alcohol
impurities
methyl alcohol
carbonic acid

A

methyl alcohol

139
Q

Neoprene is chemically known as

polybutadiene
styrene butadiene rubber (SBR)
polyurathane
polychloroprene

A

polychloroprene

140
Q

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.

A

Contact process of sulphuric acid manufacture uses nickel as the catalyst.

141
Q

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.

A

Raw materials for DDT manufacture are benzene and chlorine.

142
Q

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

A

10^2 - 10^7

143
Q

Sulphur removal by heating of pyrite ore in presence of air is called its

reduction
roasting
calcination
smelting

A

roasting

144
Q

Deacon’s method is used for the manufacture of

glauber’s salt
common salt
chlorine
graphite electrode

A

chlorine

145
Q

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.

A

Normally, the turbidity is removed by adding a coagulent prior to sedimentation.

146
Q

Laboratory glass wares which reacts with hydroflouric acid, are made of the __________ glass.

lead
borosilicate
soda lime
alkali silicate

A

borosilicate

147
Q

Prussian blue is chemically represented by

FeO.TiO2
Ca SO4 . 2H2O
Fe4 [Fe (CN6)3]
AlF3 . 3NaF

A

Fe4 [Fe (CN6)3]

148
Q

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

A

nitric acid

149
Q

The most stable allotropic form of phosphorous is the __________ phosphorous.

white
black
yellow
red

A

black

150
Q

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.

A

suspend pigments & dissolve film forming materials.

ChELE 2024 (17 decks)

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