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INDIABIX > chem process (sec 6-9) > Flashcards

chem process (sec 6-9) Flashcards

1
Q

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

A

removing some quantity of SO3 during intermediate stage.

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2
Q

Tall oil obtained as a by-product from the black liquor recovery is

A

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

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3
Q

__________ is a polysacchride.

A

Starch

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4
Q

Styrene is produced from ethyl benzene by the process of

A

dehydrogenation

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5
Q

Acetone is produced by catalytic dehydrogenation of

A

isopropanol

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6
Q

Nitrogen is an essential component of

A

proteins

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7
Q

Bromine content in sea water may be around __________ ppm.

A

70

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8
Q

Argon is the third largest constituent of air (followed by N2 & O2). Its percentage by volume in air is

A

0.94

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9
Q

Poly tetraflouro ethylene (P.T.F.E.) is known as

A

teflon

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10
Q

Bakelite is

A

same as thermosetting phenol-formaldehyde.

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11
Q

__________ is produced by the dehydrogenation of ethyl benzene.

A

Styrene

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12
Q

Which of the following is used as a coagulant in water treatment ?

A

Ferrous sulphate

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13
Q

__________ paper is used in the manufacture of newsprint paper.

A

Groundwood

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14
Q

Hydrodenation of vegetable oils is a/an __________ reaction.

A

exothermic

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15
Q

Permanent hardness of water is due to the presence of calcium & magnesium

A

sulphates & chlorides

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16
Q

Concentration of sulphide ores is done usually by

A

froth floatation

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17
Q

Dacron is a/an

A

polyester

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18
Q

Sodium carbonate (soda ash) is not used in the manufacture of

A

detergents

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19
Q

Viscose rayon

A

utilises H2SO4, NaOH and CS2 during its manufacture.

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20
Q

Nylon 6-6 is manufactured from

A

hexamethylene diamine and adipic acid.

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21
Q

Glauber’s salt is chemically represented by

A

Na2SO4.10H2O

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22
Q

Chemical name of Grignard reagent is

A

ethyl magnesium chloride.

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23
Q

Which of the following processes is absent in glass manufacturing process

A

Sintering

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24
Q

Production of one ton of dry paper pulp requires about __________ tons of bamboo or wood.

A

2.5

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25
Q

Dacron (or terylene) fibres as compared to nylon’fibres have

A

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

better heat & acid resistant properties.
poorer resistance to alkalis.
poorer dyeability.

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26
Q

The function of gypsum addition during cement making is to

A

decrease the cement setting rate.

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27
Q

Low purity oxygen is used for

A

chemical oxidation processes.

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28
Q

__________ is produced using molasses as the starting raw material.

A

Ethyl alcohol

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29
Q

Pick out the wrong statement pertaining to the properties of glasses. Glasses generally have

A

sharp melting points.

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30
Q

A substance produced by a living organism and capable of anti-microbial activity is called a/an

A

antibiotic

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31
Q

Deaeration of water in its treatment is necessary, as it

A

minimises its corrosiveness.

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32
Q

Hydrochloric acid is also known as

A

muriatic acid

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33
Q

Adipic acid is an intermediate in the manufacture of

A

nylon-66

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34
Q

The temperature in the calcium carbide furnace is __________ °C.

A

2000-2200

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35
Q

Vinyl chloride (CH2 = CH.Cl) is produced by the thermal pyrolysis of ethylene dichloride at a pressure & temperature of

A

4 kgf/cm2 & 500°C.

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36
Q

Soaps remove dirt by

A

none of these.

increasing the surface tension.
decreasing wettability.
supplying hydrophyllic group.

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37
Q

Which of the following additives/water proofing agents is added to lower the hydrophilic (moisture loving) characteristic of cement ?

A

Calcium & aluminium stearate

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38
Q

Chemical name of soda ash is

A

none of these

sodium bicarbonate
sodium thiosulphate
potassium carbonate

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39
Q

Out of the following processes of paper pulp manufacture, the maximum corrosion problem in digestion & handling equipments is encountered in the __________ process.

A

neutral sulphite semi-chemical

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40
Q

__________ is used as a flux in the extraction of iron from iron ore (hametite) in blast furnace.

A

Limestone

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41
Q

Gun powder uses

A

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

sulphur
charcoal
potassium nitrate

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42
Q

Dichloro diphenyl __________ is the full form of DDT (an insecticide).

A

trichloroethane

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43
Q

The basic difference between vegetable oils and fats is in their

A

physical state

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44
Q

Which of the following is not a food additive?

A

Ammonium chloride

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45
Q

Alum is commercially produced from

A

bauxite

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46
Q

CaO is called

A

quick lime

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47
Q

Starting raw material for the manufacture of maleic anhydride is

A

either (a) or (b)

n-butene
benzene

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48
Q

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.

A

Presence of sodium sulphate in pulp makes the pulp bleachability poor.

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49
Q

Which of the following contains least amount of N2 ?

A

Coke oven gas

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50
Q

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

A

fixed bed

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51
Q

Neoprene is a

A

synthetic rubber

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52
Q

Saponification value/number of an oil or fat is a measure of its

A

average molecular weight.

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53
Q

Ethyl alcohol cannot be produced

A

none of these.

from waste sulphite substrate of paper mills.
by esterification and hydroloysis of ethylene.
from molasses.

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54
Q

Exothermic condensation reaction of monochlorobenzene with chloral in presence of 20% oleum as catalyst produces DDT. The reaction temperature is maintained at __________ °C.

A

15-30

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55
Q

Cement mainly contains

A

CaO, SiO2, Al2O3

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56
Q

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

A

soda ash

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57
Q

Coke used for the production of calcium carbide should have

A

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

low ash content.
low ignition temperature.
high electrical resistivity.

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58
Q

Sucrose is a disaccharide consisting of

A

glucose and fructose

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59
Q

Function of sodium thiosulphate (hypo) in development of photographic film/plate is to

A

remove unexposed silver halide.

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60
Q

High temperature carbonisation of coal takes place at __________ °C

A

1100

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61
Q

White phosphorous is stored under water, because

A

its kindling temperature in dry air is very low.

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62
Q

_________ is not a constituent of gun powder.

A

Carbon

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63
Q

Hydrophilic group of a soap or detergent solution is

A

water loving

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64
Q

Rotary kiln is not involved in the production of

A

slaked lime from quick lime

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65
Q

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

A

60-70

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66
Q

Vanillin is a type of

A

flavour

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67
Q

Temporary hardness of water can be removed by

A

boiling.

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68
Q

More than 100 percent of __________ is present in oleum.

A

H2SO4

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69
Q

Pure rectified spirit contains about __________ percent alcohol.

A

95

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70
Q

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

A

-183

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71
Q

Titanium dioxide is a/an __________ colour pigment.

A

white

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72
Q

Mercury cells for caustic soda manufacture, compared to diaphragm cells

A

none of these.

require lower initial investment.
require more power.
produce lower concentration NaOH.

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73
Q

Cellulose percentage in bamboo fibre is about

A

50

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74
Q

Essential oils are usually obtained using

A

steam distillation

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75
Q

Impurities present in brine is normally removed by treatment with

A

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

NH3 and CO2.
lime and soda ash.
lime, ammonia and carbon.

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76
Q

Hydrogenation of oil/fat does not

A

none of these.

improve its resistance to rancid oxidation.
raise its melting point.
remove double bonds.

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77
Q

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

A

both (b) and (c).

has less corrosion problems.
involves higher investment in NH3 recovery units than that for crystallisation units for NH4Cl.

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78
Q

Builders are added in soap to act as

A

cleaning power booster

79
Q

H2S is scrubbed from refinery gases by absorption using

A

ethanol amine

80
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?

A

Oxidation of Cl- ions

81
Q

Zeolite is a/an

A

naturally occuring clay which is capable of exchanging cations.

82
Q

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

A

lead

83
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.

84
Q

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

A

Teflon

85
Q

Glass is

A

a super cooled liquid

86
Q

Analgesic drugs are

A

pain relievers

87
Q

Commonly used glass is known as the __________ glass.

A

soda

88
Q

fusion of limestone and __________ produces high alumina cement.

A

bauxite

89
Q

Massacuits is a terminology used in the __________ industry.

A

sugar

90
Q

The basic constituent of vegetable oils is

A

triglyceride

91
Q

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

A

groundwood

92
Q

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

A

SiO2

93
Q

Mercury electrolytic cells are preferred over diaphragm electrolytic cell (for production of caustic soda), as it

A

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.

94
Q

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

A

Chromates

95
Q

L.D. converter is used in the production of

A

steel

96
Q

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

A

benzene-toluene-xylene.

97
Q

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

A

Ca(HCO3)2

98
Q

In the Solvay process, the product from the calciner is

A

light soda ash

99
Q

Commercially ethylene is produced from naphtha by

A

hydrocracking.

100
Q

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

A

thermoplastic

101
Q

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

A

hematite

102
Q

The difference between saponification value and acid value is

A

called ester value.

103
Q

Fourdrinier machine is used in the manufacture of

A

paper

104
Q

Pencillin is made employing __________ fermentation process.

A

aerobic batch

105
Q

Sulphuric acid saturated with SO3 is called

A

oleum.

106
Q

Nylon 66 is so named because the

A

average degree of polymerisation of the polymer is 1966.

107
Q

Wet chlorine gas produced during electrolysis of brine is dehydrated by

A

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

108
Q

CaSO4 1/2.H2O is known as

A

plaster of Paris

109
Q

__________ of quicklime produces slaked lime.

A

Hydration

110
Q

Main product in calcium carbide-water reaction is

A

C2H2

111
Q

Glauber’s salt is chemically

A

none of these

calcium sulphate
potassium sulphate
potassium chlorate

112
Q

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

A

L.D. converter gas

113
Q

Baking soda is chemically represented by

A

NaHCO3

114
Q

Which of the following is an additional step in the manufacture of paper from bagasse as compared to that from bamboo ?

A

Depithing

115
Q

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

A

5

116
Q

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

A

10

117
Q

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

A

hydrogenation

118
Q

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

A

AgO

119
Q

Phenolic antiseptics are added in the __________ soap.

A

medicated

120
Q

Solvay process is used for the manufacture of

A

soda ash

121
Q

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

A

fire retardant

122
Q

Which is a high grade pulp ?

A

Sulphate pulp

123
Q

Stereospecific agents are exemplified by

A

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

radiation
supported metal oxide catalysts
ziegler catalysts

124
Q

Starting material for the production of butadiene in India is

A

ethyl alcohol

125
Q

Yellow phosphorus is transported under

A

water

126
Q

Permanent hardness of water can be removed by

A

passing it through cation & anion exchangers.

127
Q

Celluloid is chemically

A

cellulose nitrate

128
Q

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

A

sulphuric acid

129
Q

Which of the following is an explosive ?

A

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

Nitroglycerene
Trintrotoluene (TNT)
Cellulose nitrate

130
Q

Zeolite is used in the

A

water treatment.

131
Q

Thermoplastic materials

A

are heavily branched molecules.

132
Q

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

A

perchloroethylene

133
Q

Salt is added in the kettle during soap manufacture to separate

A

soap from lye.

134
Q

Manufacture of phthalic anhydride uses __________ as a catalyst.

A

V2O5

135
Q

Which of the following is not a product of coal tar distillation ?

A

None of these

Anthracene
Cresote oil
Carbolic oil

136
Q

Chrome tanning and vegetable tanning are done for

A

light & heavy leather respectively.

137
Q

Catalyst used during the manufacture of ‘Vanaspati Ghee’ is

A

nickel

138
Q

Iron ore hametite is concentrated using

A

gravity separation.

139
Q

Refractory bricks burnt at very high temperature have got

A

greater resistance to corrosion by slags.

140
Q

Nitrile rubber is produced by the polymerisation of

A

acrylonitrile and butadiene.

141
Q

Carbon disulphide is mainly used in the production of

A

viscose rayon.

142
Q

99.5% purity oxygen is used in

A

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

cutting and welding by oxy-acetylene flame.
hospitals for medicinal purposes.
gas masks and artificial breathing apparatus.

143
Q

Nylon-6 is manufactured from

A

caprolactum.

144
Q

Permanent hardness of water can be removed by

A

boiling it with Na2CO3

145
Q

Sizing material is incorporated in paper to

A

impart resistance to penetration by liquids.

146
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.

147
Q

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

A

Carbon tetrachloride

148
Q

Chemical name of aspirin (an analgesic drug) is

A

acetylsalicylic acid

149
Q

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

A

98%H2SO4

150
Q

Coal tar is used as a

A

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

binding material for coal briquettes.
fuel in rotary kiln.
binder in making carbon electrodes.

151
Q

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

A

benzene

152
Q

The purpose of adding Na2CO3 to water of low alkalinity is to

A

permit the use of alum as a coagulant.

153
Q

Ca(OH)2 is called

A

slaked lime

154
Q

Percentage of uranium in carnotite ore found in Jadugoda (Jharkhand) is about

A

0.1 to 0.5

155
Q

Potassium is kept & transported under

A

kerosene oil

156
Q

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

A

electrolytic reduction

157
Q

Bakelite is chemically known as

A

phenol formaldehyde

158
Q

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

A

H2

159
Q

Phthalic anhydride is made by the

A

oxidation of naphthalene.

160
Q

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

A

cyclo trimethylene trinitramine.

161
Q

Raw material used in alcohol distilleries in India is

A

molasses

162
Q

Oil produced by solvent extraction

A

neither (a) nor (b).

has low free fatty acid content.
is odourless.

163
Q

High acid value of an oil or fat is an indication of

A

storage under improper conditions.

164
Q

Yeast is used in the manufacture of

A

wine

165
Q

Liquefaction of gases can not be done by

A

merely compressing it beyond critical pressure.

166
Q

Anion exchanger is regenerated usually with

A

NaOH

167
Q

__________ is the major constituent of the Portland cement.

A

Tricalcium silicate

168
Q

Catalytic oxidation of naphthalene produces

A

phthalic anhydride

169
Q

Parathion and Malathion are
.

A

pesticides

170
Q

Transparent soaps (e.g. Pears) are

A

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

171
Q

Dehydrogenation of ethyl benzene produces

A

styrene

172
Q

Reaction of ethylene glycol and dimethyl terephthalate (DMT) produces

A

dacron

173
Q

Lindane is

A

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

174
Q

Solvay process is not used for the manufacture of potassium carbonate, because of the reason that potassium bicarbonate

A

is soluble in ammonium chloride and potassium chloride solution.

175
Q

Which of the following is a bleaching agent added in the detergents to facilitate removal of stains caused due to blood, tea etc?

A

Sodium borate

176
Q

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

A

CaCl2

177
Q

At very high concentration of enzymes, the rate of fermentation chemical reaction is __________ the concentration of reactants.

A

independent of

178
Q

Which of the following is a constituent of vinegar ?

A

Both (a) and (b)

Around 10% alcohol
Around 1% acetic acid

179
Q

During the manufacture of sulphuric acid, the temperature of molten sulphur is not increased beyond 160°C, as

A

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

180
Q

Kopper-Totzek coal gasifier

A

can give ammonia synthesis gas (H2 + N2).

181
Q

Addition of calcium oxide to water produces

A

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

exothermic heat
hissing sound
slaked lime

182
Q

Sodium bisulphite is used for __________ water.

A

both (a) & (b)

deaeration
dechlorination

183
Q

Riboflavin is a/an

A

vitamin

184
Q

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

A

200

185
Q

Presence of sodium tripolyphosphate (an additive) in synthetic detergent

A

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

186
Q

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

A

Na2CO3.H2O

187
Q

Reverse osmosis is normally used for the

A

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

188
Q

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

A

CO & H2

189
Q

Litharge is

A

lead oxide

190
Q

Coagulant is used __________ filtration.

A

before

191
Q

10% oleum comprises of 10% free

A

SO3

192
Q

Use of chlorine in the treatment of sewage

A

helps in grease separation.

193
Q

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

A

precipitation

INDIABIX (11 decks)

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