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ChELE 2024 > IBX - CPI Sec. 7 to 9 > Flashcards

IBX - CPI Sec. 7 to 9 Flashcards

IndiaBIX - Chemical Process (Sections 7 to 9)

1
Q

Which of the following contains least amount of N2?

Coke oven gas
Blast furnace gas
Producer gas
Water gas (blue gas).

A

Coke oven gas

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2
Q

Calcination of limestone is not done in a __________ kiln for producing lime.

vertical shaft
rotary
fluidised bed
fixed bed

A

fixed bed

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3
Q

Neoprene is a

monomer
synthetic rubber
polyester
none of these

A

synthetic rubber

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4
Q

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.

A

average molecular weight.

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5
Q

Ethyl alcohol cannot be produced

from waste sulphite substrate of paper mills.
by esterification and hydroloysis of ethylene.
from molasses.
none of these.

A

none of these.

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6
Q

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

A

15-30

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7
Q

Cement mainly contains

CaO, SiO2, Al2O3
MgO, SiO2, K2O
Al2O3, MgO, Fe2O3
CaO, MgO, K2O

A

CaO, SiO2, Al2O3

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8
Q

Sand and __________ is fused at 1300°C, to produce sodium silicate.

limestone
soda ash
coke
sodium sulphate

A

soda ash

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9
Q

Coke used for the production of calcium carbide should have

low ash content.
low ignition temperature.
high electrical resistivity.
all (a), (b) and (c).

A

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

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10
Q

Sucrose is a disaccharide consisting of

glucose and glucose
glucose and fructose
glucose and galactose
fructose and galactose

A

glucose and fructose

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11
Q

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.

A

remove unexposed silver halide.

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12
Q

High temperature carbonisation of coal takes place at __________ °C.

2000
700
1100
< 500

A

1100

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13
Q

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.

A

its kindling temperature in dry air is very low.

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14
Q

__________ is not a constituent of gun powder.

Carbon
Charcoal
Sulphur
Potassium nitrate

A

Carbon

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15
Q

Hydrophilic group of a soap or detergent solution is

water hating
soil loving
water loving
none of these

A

water loving

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16
Q

Rotary kiln is not involved in the production of

cement
lime from limestone
slaked lime from quick lime
none of these

A

slaked lime from quick lime

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17
Q

Mercury electrolytic cell produces 50-70% NaOH solution. Its operating temperature is __________ °C.

25
60-70
150-200
250-300

A

60-70

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18
Q

Vanillin is a type of

anti-pyretic drug
food preservative
flavour
dye

A

flavour

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19
Q

Temporary hardness of water can be removed by

addition of alum (a coagulant).
boiling.
filtration (through gravity sand filter).
addition of lime.

A

boiling.

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20
Q

More than 100 percent of __________ is present in oleum.

SO3
H2SO4
H2SO3
SO2

A

H2SO4

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21
Q

Pure rectified spirit contains about __________ percent alcohol.

45
70
95
99.5

A

95

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22
Q

Oxygen is separated by distillation from air after its liquefaction. The boiling point of oxygen is about __________ °C.

-83
-183
-196
-218

A

-183

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23
Q

Titanium dioxide is a/an __________ colour pigment.

white
black
yellow
blue

A

white

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24
Q

Mercury cells for caustic soda manufacture, compared to diaphragm cells

require lower initial investment.
require more power.
produce lower concentration NaOH.
none of these.

A

none of these.

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25
Q

Cellulose percentage in bamboo fibre is about

10
20
50
85

A

50

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26
Q

Essential oils are usually obtained using

steam distillation
extractive distillation
solvent extraction
leaching

A

steam distillation

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27
Q

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).

A

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

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28
Q

Hydrogenation of oil/fat does not

improve its resistance to rancid oxidation.
raise its melting point.
remove double bonds.
none of these.

A

none of these.

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29
Q

Solvay process as compared to dual process (i.e. modified Solvay process)

can use low grade brine.
has less corrosion problems.
involves higher investment in NH3 recovery units than that for crystallisation units for NH4Cl.
both (b) and (c).

A

both (b) and (c).

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30
Q

Builders are added in soap to act as

cleaning power booster
anti-redeposition agent
corrosion inhibitor
fabric brightener

A

cleaning power booster

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31
Q

H2S is scrubbed from refinery gases by absorption using

dilute H2SO4
ethanol amine
chilled water
tri-butyl phosphate

A

ethanol amine

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32
Q

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

A

Oxidation of Cl- ions

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33
Q

Zeolite is a/an

naturally occuring clay which is capable of exchanging cations.
abrasive material.
catalyst used in shift conversion.
none of these.

A

naturally occuring clay which is capable of exchanging cations.

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34
Q

Type of glass used in optical work is the __________ glass.

soda-lime
fibre
lead
borosilicate

A

lead

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35
Q

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.

A

Transparent soaps are made by cold process.

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36
Q

Ceramics are produced from silicates or clayish materials: Which of the following is not a ceramic material?

Slag cement
Glasses
Porcelain/Potteries
Teflon

A

Teflon

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37
Q

Glass is

mainly CaO
subjected to galvanising
a super cooled liquid
all (a), (b) and (c)

A

a super cooled liquid

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38
Q

Analgesic drugs are

pain relievers
antibiotics
used in the treatment of T.B.
used in the treatment of typhiod

A

pain relievers

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39
Q

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

A

-183

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40
Q

Commonly used glass is known as the __________ glass.

flint
hard
pyrex
soda

A

soda

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41
Q

Fusion of limestone and __________ produces high alumina cement.

sand
bauxite
quicklime
calcite

A

bauxite

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42
Q

Massacuits is a terminology used in the __________ industry.

paint
oil hydrogenation
soap
sugar

A

sugar

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43
Q

The basic constituent of vegetable oils is

triglyceride
fatty acids
fatty alcohol
mono esters

A

triglyceride

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44
Q

The most economical pulp for the production of newsprint would be the __________ pulp.

groundwood
sulphate
sulphite
semichemical

A

groundwood

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45
Q

Which of the following is the second major component of cement?

Al2O3
SiO2
CaO
Fe2O3

A

SiO2

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46
Q

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).

A

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

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47
Q

__________ are used as corrosion inhibitor for iron & steel in aqueous solutions.

Phosphates
Chromates
Sulphates
Bi-carbonates

A

Chromates

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48
Q

L.D. converter is used in the production of

pig iron
steel
copper
zinc

A

steel

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49
Q

The terminology ‘BTX’ used in coal tar distillation industry refers to

benzol-toluol-xylol.
benzol-toluene-xylene.
benzene-toluol-xylol.
benzene-toluene-xylene.

A

benzene-toluene-xylene.

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50
Q

Which of the following is not responsible for causing permanent hardness of water?

Ca(HCO3)2
CaCl2
MgCl2
none of these

A

Ca(HCO3)2

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51
Q

In the Solvay process, the product from the calciner is

light soda ash
dense soda ash
sodium bicarbonate
dehydrated soda ash

A

light soda ash

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52
Q

Commercially ethylene is produced from naphtha by

catalytic cracking.
catalytic dehydrogenation.
pyrolysis.
hydrocracking.

A

hydrocracking.

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53
Q

Poly Vinyl Chloride (P.V.C.) is a __________ material.

thermosetting
thermoplastic
fibrous
chemically active

A

thermoplastic

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54
Q

Pig iron is produced by blast furnaces in India using mostly the iron ore named

hematite
magnetite
siderite
chalcopyrite

A

hematite

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55
Q

The difference between saponification value and acid value is

called ester value.
always negative.
constant for all fatty oils.
none of these.

A

called ester value.

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56
Q

Fourdrinier machine is used in the manufacture of

nylon-6
paper
antibiotics
sugar

A

paper

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57
Q

Pencillin is made employing __________ fermentation process.

continuous
aerobic batch
anaerobic batch
none of these

A

aerobic batch

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58
Q

Sulphuric acid saturated with SO3 is called

concentrated H2SO4.
sulphurous acid.
oleum.
none of these.

A

oleum.

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59
Q

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.

A

average degree of polymerisation of the polymer is 1966.

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60
Q

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.

A

spraying 66° Be H2SO4 counter current to the flow of the gas.

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61
Q

CaSO4⋅H2O is known as

blue vitriol
plaster of Paris
gypsum
zeolite

A

plaster of Paris

62
Q

__________ of quicklime produces slaked lime.

Hydration
Dehydration
Hydrogenation
none of these

A

Hydration

63
Q

Main product in calcium carbide-water reaction is

Ca(OH)2
C2H2
CO2
CaCO3

A

C2H2

64
Q

Glauber’s salt is chemically

calcium sulphate
potassium sulphate
potassium chlorate
none of these

A

none of these

65
Q

Which of the following fuel gases contains maximum amount of carbon monoxide?

Coke oven gas
Water gas
Blast furnace gas
L.D. converter gas

A

L.D. converter gas

66
Q

Baking soda is chemically represented by

Na2CO3
NaHCO3
Na2CO3.H2O
Na2CO3.10H2O

A

NaHCO3

67
Q

P.T.F.E. (Poly tetra fluoro ethylene) is commercially known as

bakelite
neoprene
teflon
nylon-66

A

teflon

68
Q

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

A

Depithing

69
Q

Percentage of glycerene present in the spent lye obtained during soap manufacture is about

0.5
5
20
35

A

5

70
Q

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

10
25
50
98

A

10

71
Q

Commercial production of Vanaspati is done by __________ of edible vegetable oils.

hydrogenation
oxidation
hydrolysis
hydrocracking

A

hydrogenation

72
Q

Which catalyst is used in the manufacture of ethylene oxide by oxidation of ethylene?

AgO
Al2O3
ZnCl2
Fe2O3

A

AgO

73
Q

Phenolic antiseptics are added in the __________ soap.

shaving
medicated
metallic
transparent

A

medicated

74
Q

Solvay process is used for the manufacture of

caustic soda
soda ash
caustic potash
soda lime

A

soda ash

75
Q

A mixture of chlorine & sodium bromide acts as a/an

insecticides
analgesic drug
fire retardant
hydrogenation catalyst

A

fire retardant

76
Q

Which is a high grade pulp?

Rag pulp
Mechanical pulp
Sulphate pulp
Sulphite pulp

A

Sulphate pulp

77
Q

Stereospecific agents are exemplified by

radiation
supported metal oxide catalysts
ziegler catalysts
all (a), (b) & (c)

A

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

78
Q

Starting material for the production of butadiene in India is

naphthalene
benzol
ethyl alcohol
phthalic anhydride

A

ethyl alcohol

79
Q

Yellow phosphorus is transported under

air
water
nitrogen
helium

A

water

80
Q

Permanent hardness of water can be removed by

simply boiling.
adding alum.
passing it through cation & anion exchangers.
all (a), (b) and (c).

A

passing it through cation & anion exchangers.

81
Q

Celluloid is chemically

cellulose acetate
regenerated cellulose
cellulose nitrate
cellulose acetate butyrate

A

cellulose nitrate

82
Q

Double Contact Double Absorption (DCDA) process is the most recent process for the manufacture of

nitric acid
sulphuric acid
ammonium sulphate
hydrochloric acid

A

sulphuric acid

83
Q

Which of the following is an explosive?

Nitroglycerene
Trintrotoluene (TNT)
Cellulose nitrate
All (a), (b), and (c)

A

All (a), (b), and (c)

84
Q

Zeolite is used in the

water treatment.
glass manufacture.
hydrogenation of fatty oil as a catalyst.
development of exposed photographic plate.

A

water treatment.

85
Q

Thermoplastic materials

do not soften on application of heat.
are heavily branched molecules.
are solvent insoluble.
none of these.

A

none of these.

86
Q

Carbon tetrachloride (CCl4) is the starting raw material for the manufacture of

trichloroethylene
perchloroethylene
parathion
methanol

A

perchloroethylene

87
Q

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.

A

soap from lye.

88
Q

Manufacture of phthalic anhydride uses __________ as a catalyst.

Ni
Cr
V2O5
Al2O3

A

V2O5

89
Q

Which of the following is not a product of coal tar distillation?
Anthracene
Cresote oil
Carbolic oil
None of these

A

None of these

90
Q

Teflon is

phenol formaldehyde.
an inorganic polymer.
poly tetrafluoroethylene (P.T.F.E.).
a monomer.

A

poly tetrafluoroethylene (P.T.F.E.).

91
Q

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.

A

light & heavy leather respectively.

92
Q

Catalyst used during the manufacture of ‘Vanaspati Ghee’ is

zinc
nickel
platinum
copper

A

nickel

93
Q

Iron ore hametite is concentrated using

electromagnetic separation mainly.
gravity separation.
froth floatation.
roasting.

A

gravity separation.

94
Q

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.

A

greater resistance to corrosion by slags.

95
Q

Nitrile rubber is produced by the polymerisation of

acrylonitrile and butadiene.
acrylonitrile and styrene.
isobutylene and isoprene.
none of these.

A

acrylonitrile and butadiene.

96
Q

Carbon disulphide is mainly used in the production of

viscose rayon.
corundum.
plasticiser for unsaturated polyester.
paints.

A

viscose rayon.

97
Q

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).

A

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

98
Q

Nylon-6 is manufactured from

caprolactum.
hexamethylene diamine and adipic acid.
hexamethylene diamine and maleic anhydride.
hexamethylene diamine and sebacic acid.

A

caprolactum.

99
Q

Permanent hardness of water can be removed by

boiling.
adding Ca(OH)2.
boiling it with Na2CO3.
none of these.

A

boiling it with Na2CO3.

100
Q

Sizing material is incorporated in paper to

impart resistance to penetration by liquids.
increase its thickness.
increase its flexibility & opacity.
increase its brightness.

A

impart resistance to penetration by liquids.

101
Q

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.

A

Oils and fats are alkaloids.

102
Q

Which of the following, when pyrolysed, produces perchloro-ethylene?

Ethylene dichloride
Chlorobenzene
Carbon tetrachloride
Chlorinated paraffin

A

Carbon tetrachloride

103
Q

Chemical name of aspirin (an analgesic drug) is

acetylsalicylic acid
nictonic acid
calcium acetate
methyl salicylate

A

acetylsalicylic acid

104
Q

Which is the most efficient absorbant for SO3 out of the following?

20% oleum
65% oleum
78%H2SO4
98%H2SO4

A

98%H2SO4

105
Q

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).

A

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

106
Q

Caprolactum (a raw material for nylon-6 manufacture) is produced from

phenol
naphthalene
benzene
pyridine

A

benzene

107
Q

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).

A

permit the use of alum as a coagulant.

108
Q

Ca(OH)2 is called

quicklime
slaked lime
limestone
gypsum

A

slaked lime

109
Q

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

A

0.1 to 0.5

110
Q

Potassium is kept & transported under

water
liquid ammonia
kerosene oil
alcohol

A

kerosene oil

111
Q

The metallic aluminium is obtained from pure alumina in the presence of fused cryolite by

electrolysis
electrolytic reduction
electrolytic oxidation
none of these

A

electrolytic reduction

112
Q

Bakelite is chemically known as

polyvinyl chloride (PVC)
polybutadiene
phenol formaldehyde
polyurathane

A

phenol formaldehyde

113
Q

Which of the following is a co-product during the manufacture of caustic soda by electrolysis of brine?

Na2CO3
NaHCO3
H2
none of these

A

H2

114
Q

Phthalic anhydride is made by the

oxidation of naphthalene.
oxidation of benzene.
dehydrogenation of ethyl benzene.
none of these.

A

oxidation of naphthalene.

115
Q

RDX (an explosive), which is more sensitive but less toxic than TNT, is chemically

cyclo trimethylene trinitramine.
trinitro resorcinol.
cyclo tetramethylene tetranitramine.
trinitro benzene.

A

cyclo trimethylene trinitramine.

116
Q

Raw material used in alcohol distilleries in India is

molasses
benzol
methylated spirit
none of these

A

molasses

117
Q

Oil produced by solvent extraction

has low free fatty acid content.
is odourless.
both (a) &(b).
neither (a) nor (b).

A

neither (a) nor (b).

118
Q

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.

A

storage under improper conditions.

119
Q

Yeast is used in the manufacture of

pencillin
antibiotics
wine
pasteurised milk

A

wine

120
Q

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.

A

merely compressing it beyond critical pressure.

121
Q

Anion exchanger is regenerated usually with

NaOH
H2SO4
hydrazine
alum solution

A

NaOH

122
Q

__________ is the major constituent of the Portland cement.

Calcium carbonate
Calcium oxide
Tricalcium silicate
Calcium sulphate

A

Tricalcium silicate

123
Q

Catalytic oxidation of naphthalene produces

styrene
phenol
phthalic anhydride
none of these

A

phthalic anhydride

124
Q

Parathion and Malathion are

pesticides.
plasticisers for unsaturated polysters.
pain-relieving drugs (analgesic).
tranquilisers.

A

pesticides.

125
Q

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.

A

usually soft soap (made from coconut oil) in which cane sugar & alcohol are added and finally washed with methylated spirit to achieve transparency.

126
Q

Dehydrogenation of ethyl benzene produces

styrene
naphthalene
phenol
benzoic acid

A

styrene

127
Q

Reaction of ethylene glycol and dimethyl terephthalate (DMT) produces

nylon-6
dacron
polyester
PVC

A

dacron

128
Q

Lindane is

not a fumigant.
BHC (Benzene Hexa Chloride) containing 99% γ-isomer.
a by-product of BHC manufacture.
both(b) and (c).

A

BHC (Benzene Hexa Chloride) containing 99% γ-isomer.

129
Q

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).

A

is soluble in ammonium chloride and potassium chloride solution.

130
Q

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

A

Sodium borate

131
Q

In the production of soda ash by Solvay process, the by-product is

CaCl2
NH4Cl
NH3
NaOH

A

CaCl2

132
Q

The ideal pulp for the manufacture of paper should have high __________ content.

cellulose
lignin
both (a) & (b)
none of these

A

cellulose

133
Q

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

A

independent of

134
Q

Which of the following is a constituent of vinegar?

Around 10% alcohol
Around 1% acetic acid
Both (a) and (b)
Neither (a) nor (b

A

Both (a) and (b)

135
Q

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.

A

its viscosity is not reduced on further heating (hence pressure drop on pumping it, cannot be further reduced).

136
Q

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

A

can give ammonia synthesis gas (H2 + N2).

137
Q

Addition of calcium oxide to water produces

exothermic heat
hissing sound
slaked lime
all (a), (b) & (c)

A

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

138
Q

Sodium bisulphite is used for __________ water.

deaeration
dechlorination
both (a) & (b)
neither (a) nor(b)

A

both (a) & (b)

139
Q

Riboflavin is a/an

vitamin
analgesic drug
anaesthetics
anti-malarial drug

A

vitamin

140
Q

Flash point of most vegetable oils is about __________ °C.

50
100
200
300

A

200

141
Q

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.

A

facilitates its use even in hard water (by sequestering the water-hardening Ca & Mg ions).

142
Q

Dense soda ash used in the manufacture of glass, is chemically represented by

Na2CO3
Na2CO3⋅10H2O
Na2CO3⋅H2O
Na2HCO3

A

Na2CO3⋅H2O

143
Q

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.

A

desalination of brackish water to produce potable (drinking) water.

144
Q

Hydrazine is largely used

as a starting material for ‘hypo’.
in photographic industry.
as rocket fuel.
in printing industry.

A

as rocket fuel.

145
Q

‘Synthesis gas’ meant for the synthesis of organic compound is a variable mixture of

N2 & H2
CO2 & H2
CO & H2
C & H2

A

CO & H2

146
Q

Litharge is

lead oxide
zinc oxide
zinc sulphide
cellulosic photographic material

A

lead oxide

147
Q

Coagulant is used __________ filtration.

before
after
during
to avoid

A

before

148
Q

10% oleum comprises of 10% free

SO2
H2SO3
SO3
H2SO4

A

SO3

149
Q

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.

A

helps in grease separation.

150
Q

Removal of dirt/soil by soaps or detergent does not involve the __________ of soil.

emulsification
dispersion
precipitation
wetting

A

precipitation

ChELE 2024 (17 decks)

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