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INDIABIX > chem process (sec 10-14) > Flashcards

chem process (sec 10-14) Flashcards

1
Q

A unit operation is exemplified by the process of

A

desorption

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2
Q

The major constituents of glass are

A

sand, lime and soda ash

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3
Q

Margarine is a/an

A

fat

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4
Q

Oils and fats are converted to soap in a process called

A

saponification

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5
Q

Glycerine can be obtained from

A

fat

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6
Q

Blue vitriol is chemically

A

copper sulphate

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7
Q

Trinitro-toluene (TNT) is

A

an explosive.

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8
Q

Thorium is mainly used

A

for the manufacture of gas mantles.

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9
Q

During the absorption of HCl gas in water (to produce liquid HCl), the gas is kept above dew point to

A

avoid corrosion.

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10
Q

Good quality of edible salt is obtained from brine by the process of

A

vacuum evaporation

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11
Q

Electric bulbs are made of __________ glass.

A

flint

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12
Q

Which of the following is used as a binding material in soap to improve soap texture ?

A

Borax

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13
Q

An alkali metal salt of palmitic acid is known as

A

metallic soap

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14
Q

Washing soda is chemically represented by

A

Na2CO3.10H2O

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15
Q

Magnesium and calcium __________ cause temporary hardness of water.

A

bicarbonates

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16
Q

Which form of sulphur is the most stable at room temperature ?

A

Rhombic

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17
Q

Vegetable oils and fats basically differ in their

A

physical state

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18
Q

Average sulphur content in Indian pyrites is about __________ percent.

A

35

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19
Q

Oil is a/an

A

mixture of glycerides of fatty acids.

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20
Q

Which of the following is a constituent of coffee ?

A

Caffeine

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21
Q

Which of the following is the main constituent of the mother liquor produced in salt industry ?

A

Bromine

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22
Q

Silicon carbide is a/an

A

adhesive

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23
Q

Oxygen is produced by fractionation of air using __________ process.

A

either (a) or (b)

Linde’s
Claude’s

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24
Q

Trinitrotoluene (TNT), an explosive, is made by the nitration of

A

toluene

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25
Q

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

A

Ferric sulphate

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26
Q

Carborundum consists mainly of

A

silicon carbide

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27
Q

Wax is a

A

mixture of esters of polyhydric alcohols excepting glycerine.

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28
Q

Catalyst used in the hydrogenation of oil is

A

nickel

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29
Q

Viscose rayon is

A

none of these.

cellulose nitrate.
regenerated cellulose nitrate.
regenerated cellulose acetate.

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30
Q

Triple superphosphate is manufactured by reacting

A

phosphate rock with phosphoric acid.

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31
Q

Use of hydrated lime in water treatment

A

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

before filtration, reduces the bacterial load on filters.
after filtration, combats the corrosive-ness of water due to the presence of O2 & CO2.
is to adjust the pH value.

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32
Q

Higher vicosity index of a lubricating oil denotes

A

less changes in fluidity of oil with temperature.

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33
Q

Le-Blanc process is a primitive process for the manufacture of

A

soda ash

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34
Q

How much temperature is maintained during quicklime manufacture in the calcination zone of the vertical shaft kiln?

A

1000°C

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35
Q

Cement setting under water employs a/an __________ process.

A

hydration

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36
Q

are added in lacquers to remove film brittleness and to improve adhereness.

A

Plasticisers

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37
Q

Washing of coal is done to

A

both(b) and (c).

remove the adhering impurities.
reduce the ash content.

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38
Q

Systemic insecticides

A

are absorbed throughout the plant.

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39
Q

Dry ice (solidified CO2) is used for the

A

storage & shipment of frozen foods and ice-creams.

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40
Q

In nylon-66, the first and second numbers (i.e., 6) respectively designate the number of carbon atoms present in the

A

diamine and the dibasic acid.

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41
Q

Chemical formula of BHC, which is an insecticide is

A

C6H6Cl6

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42
Q

A bio-catalyst produced by living cells which acts independent of the cell is called a/an

A

enzyme

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43
Q

Pick out the wrong statement.

DDT is manufactured by the condensation of chlorobenzene with chloral at 30°C in presence of oleum, which is a highly exothermic reaction.

Chloral is obtained by the chlorination of ethyl alcohol.

Insecticides acting on the insects through the respiratory system are called fumigants.

Benzene hexachloride is not a contact insecticide.

A

Benzene hexachloride is not a contact insecticide.

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44
Q

The product obtained on mixing calcium oxide with water is called

A

slaked lime

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45
Q

The major constituent of black liquor generated during paper manufacture is sodium

A

carbonate

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46
Q

Plaster of Paris is

A

CaSO4 1/2H2O
used for setting of broken bones

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47
Q

Exothermic neutralisation reaction between caustic soda and dodecylbenzene sulphonic acid produces sodium dodecylbenzene sulphate, which is a/an

A

detergent

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48
Q

Conversion of SO2 to SO3 in Monsanto 4-pass converter is about __________ percent.

A

98

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49
Q

Coke oven gas consists mainly of

A

H2, & CH4

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50
Q

Chemical name of ‘alum’ is

A

aluminium sulphate.

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51
Q

Lithopaneis

A

ZnS (white pigment)

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52
Q

What products do we get on electrolysis of saturated brine using steel cathode and graphite anode in an electrolytic cell ?

A

Cl2, H2 & NaOH solution.

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53
Q

Chemical formula of ‘salt cake’ is

A

Na2SO4

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54
Q

Temperature during hydrogenation of oil should not be more than 200°C, otherwise it will result in

A

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

pyrolysis of oil.
sintering of porous catalyst.
hydrogen embrittlement.

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55
Q

Nicotine is

A

both (a) and (b).

a volatile alkaloid.
obtained by treating by-products of the tobacco processing industry.

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56
Q

Separation of fresh water from sea water can be done by the __________ operation.

A

reverse osmosis

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57
Q

Na2CO3.10H2O is called

A

washing soda

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58
Q

Reaction of an alcohol with organic acid is called the __________ reaction.

A

esterification

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59
Q

Ethanol amine is produced using ammonia and

A

ethylene oxide

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60
Q

__________ acid is an unsaturated fatty acid.

A

Oleic

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61
Q

CO & H2 are the constituents of

A

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

producer gas
water gas
coke oven gas

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62
Q

Economics of ‘Solvay Process’ depends upon the efficiency of

A

ammonia recovery and size of the plant

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63
Q

__________ is a thermosetting plastic.

A

Bakelite

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64
Q

Na2CO3 is called

A

soda ash

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65
Q

Flux addition during smelting of ore is done to

A

remove impurities/gangue.

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66
Q

Hydrazine is used in water treatment for the removal of

A

dissolved oxygen

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67
Q

Direct conversion of chemical energy into electrical energy is done in a

A

fuel cell.

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68
Q

Which of the following is not produced commercially from sea water ?

A

Iodine

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69
Q

Pick out the wrong statement.

(a) Dry process is used for the manufacture of cement, when the raw material is blast furnace slag.
(b)Portland cement is made employing wet process.
(c) Gypsum is added to portland cement to lengthen its setting time.
(d) none of these.

A

none of these.

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70
Q

Nylon-6 as compared to Nylon-66 is having higher

A

none of these

hardness
abrasion/resistance
melting point

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71
Q

Digestion of wood-base materials (for manufacture of pulp) is done to

A

remove lignin.

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72
Q

Soap cannot be used with hard water, because

A

they form insoluble calcium soaps which precipitate.

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73
Q

Which of the following is not an antibiotic ?

A

Quinine

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74
Q

The most reactive allotropic form of phosphorus is __________ phosphorus.

A

yellow

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75
Q

Plasticisers are added to synthetic plastics to

A

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

impart flexibility.
improve workability during fabrication.
develop new improved properties not present in the original resins.

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76
Q

Rosin soap is added during paper manufacture to

A

impart resistance to penetration by liquids.

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77
Q

Hydrogen gas is not produced commercially (for nitrogeneous fertiliser manufacture) by

A

iron-steam reaction.

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78
Q

Carboxymethyl cellulose (CMC) is added in detergents to

A

prevent redeposition of soil on cleaned surface.

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79
Q

Synthesis gas is a mixture of

A

CO and H2

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80
Q

Which of the following impurities in feed water for high pressure boiler is the most detrimental ?

A

Silica

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81
Q

Which glass is usually used in optical work?

A

Lead glass

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82
Q

Fourdrinier machine is used in the manufacture of

A

paper

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83
Q

The most popular and common detergent i.e., alkyl benzene sulfonate (ABS) is a/an __________ detergent.

A

anionic

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84
Q

Reaction of calcium carbide with water produces a gas, which is used

A

both (a) & (b).

as an illuminant.
for metal cutting/welding.

85
Q

Salt is the basic raw material for the manufacture of

A

caustic soda

86
Q

Pick out the wrong statement.

Low intensity explosives are also called propellants, whereas high intensity explosive are called detonators.

Gun powder comprises of 75% salt petre, 15% charcoal and 10% sulphur.

Lead azide is a popular military explosive.

TNT is a hygroscopic explosive having very high melting point and is non-toxic to human being.

A

TNT is a hygroscopic explosive having very high melting point and is non-toxic to human being.

87
Q

Hydrocynic acid (HCN) is used as an insecticide for

A

citrus fruits

88
Q

Hydrazine (N2H4) is used mainly as a/an

A

rocket fuel

89
Q

Molecular weight of plastics ranges from

A

20000 to 250000

90
Q

Acrylonitrile is mainly used in the __________ industry.

A

dyeing

91
Q

The enzyme which converts starch into the disacharides maltose is

A

diastase

92
Q

Pick out the false statement pertaining to water treatment.

Aeration of water is effective in CO2 removal.

The zeolite water softening process reduces the hardness of water by not more than 50%.

Sodium sulphate or sodium carbonate do not cause hardness in water.

Water with pH value less than 7, is acidic.

A

The zeolite water softening process reduces the hardness of water by not more than 50%.

93
Q

Presence of H2S in raw water (to be chlorinated) results in the

A

increased dosage of chlorine to provide a disinfecting residual in the water.

94
Q

Contact process of sulphuric acid manufacture

A

yields acid of higher concentration than chamber process.

95
Q

Fat dispersed in water is exemplified by

A

butter

96
Q

Maleic anhydride is produced by catalytic oxidation of

A

benzene

97
Q

Catalyst used in the oxidation of benzene to produce maleic anhydride is

A

V2O5

98
Q

Widely used method for the conditioning of boiler feed water is the

A

hot-lime soda process

99
Q

Blue colour is imparted to glass by the addition of

A

CaO

100
Q

In the manufacture of viscose rayon, the raw material used industrially is

A

fine teak wood

101
Q

Bordeaux mixture is a/an

A

inorganic fungicide

102
Q

Silicone is a/an

A

inorganic polymer

103
Q

ickel is not used as a catalyst in the __________ reaction.

A

shift conversion

104
Q

Molasses is the starting material for the production of

A

alcohol

105
Q

BHC (Benzene hexachloride) is made by the chlorination of benzene

A

which is an addition reaction.

106
Q

Diaphragm electrolytic cell as compared to mercury electrolytic cell

A

requires lesser investment for similar capacity.

107
Q

Calcareous & argillaceous materials are used in the manufacture of

A

cement

108
Q

Pick out the wrong statement.

A

none of these.

Azoic dyes are mostly applied on cotton fabrics.
Basic dyes (e.g. amino derivatives) are applied mostly to paper.
Mordant dyes are applied mainly to wools.

109
Q

Commercial production of calcium carbide requires limestone and __________ as raw materials.

A

coke

110
Q

Which one of the following is not likely to be a constituent of vegetable oils ?

A

Citric acid

111
Q

Nitroglycerene absorbed in wood flour, sodium nitrate or ammonium nitrate is commercially used as a controlled explosive called dynamite. The raw material used for its manufacture are glycerene, nitric acid and

A

sulphuric acid

112
Q

The process involved in converting rubber into a thin sheet or coating it on fabric is called

A

calendering

113
Q

Detergent is produced by the sulphonation of dodecyl benzene, which is an __________ reaction.

A

both (b) and (c)

exothermic
irreversible

114
Q

Air used in aerobic fermentation must be sterilized, otherwise the

A

contamination of pure culture would result.

115
Q

High temperature carbonisation of coal produces

A

none of these.

inferior coke compared to low temperature carbonisation.
less of gases compared to liquid products.
larger quantity of tar compared to low temperature carbonisation.

116
Q

Alcohol content in freshly prepared natural and fortified wine may be respectively around __________ percent.

A

7-14 and 14-30

117
Q

Setting of plaster of paris is accompanied with

A

hydration

118
Q

Process conditions in fermentator used for production of penicillin is

A

25°C, 2 atm.

118
Q

Platinum is a versatile catalyst for many processes in chemical industries. It is highly prone to be poisoned by the presence of

A

arsenic

118
Q

Bleaching of paper pulp is done with

A

chlorine or chlorine dioxide

118
Q

Sodium chloride content in sea water is about __________ gms/litre.

A

25

119
Q

Fluorescent dyes are added in detergents to

A

act as fabric brightener (by converting ultraviolet light to visible light) thereby improving the whiteness appearance of white fabrics.

119
Q

High magnesia lime is added to hot sugar cane juice (during the manufacture of sugar) to

A

both (a) and (b).

flocculate the impurities.
facilitate fast filtration.

119
Q

Polyvinyl chloride (PVC) is

A

made by employing emulsion polymerisation.

120
Q

Pick out the wrong statement.

Kraft method of pulp manufacture can process all types of fibrous raw materials.

Digestion time for bagasse is less than that for wood base materials.

Both temperature and pressure in the digestor is less in case of the sulphite method as compared to that in the sulphate method.

none of these.

A

none of these.

120
Q

Consider the production of ammonia from methene and air as raw materials. The catalyst used are: (i) __________ for steam reforming of methane and (ii) __________ for ammonia synthesis.

A

i - Ni/Al2O3; ii - Fe/Al2O3

120
Q

Isopropyl benzene produced by alkylation of benzene with propylene is known as

A

cumene

120
Q

Main constituents of natural rubber is

A

polyisoprene

120
Q

For the hydrogenation of oils __________ (A) __________ is commonly used as catalyst and __________ (B) __________ is a catalyst poison.

A

(A) nickel (B) sulphur

120
Q

Highly porous refractory bricks are

A

none of these.

less susceptible to chemical attack by molten fluxes and gases etc.
very strong.
having very high thermal conductivity.

121
Q

Fumigant insecticides

A

emit poisonous vapour.

121
Q

Which of the following is an endothermic reaction ?
Absorption of SO3 in 98% H2SO4.
C + H2O = CO + H2.
Thermal dissociation of iron pyrites.
Both (b) and (c).

A

Both (b) and (c).

121
Q

Fermentator temperature during production of alcohol from molasses is around __________ °C.

A

30

121
Q

Cooking liquor in case of sulphite process is

A

sodium sulphite and sodium bisulphite.

121
Q

Which of the following is not an abrasive material ?

A

Bakelite

121
Q

90% of the caprolactum is converted to nylon-6 on its condensation polymerisation in the reactor maintained at __________ °C.

A

10-30

122
Q

Pick out the wrong statement.
Hard glass which is used for making laboratory glass wares is a mixture of sodium borosilicate and aluminium borosilicate.
Glass is decolorised during its manufac-ture by adding antimony oxide, mangnese dioxide or arsenic oxide.
Ordinary glass is represented chemically by Na2O . CaO . 6SiO2.
Red color is imparted to glass by addition of arsenic oxide.

A

Red color is imparted to glass by addition of arsenic oxide.

122
Q

Finely ground calcium aluminate & silicate is a/an

A

cement

123
Q

Vegetable oils contain large quantity of glycerides of unsaturated acids. When the vegetable oils contain high amount of saturated fatty acids, it is termed as __________ oil.

A

non-drying

124
Q

Fats as compared to oils have

A

less unsaturated glycerides of fatty acids.

125
Q

Thermal pyrolysis of ethylene dichloride produces

A

vinyl chloride

126
Q

The main component of pyrex glass is

A

lead

127
Q

Alum [Al2(SO4)3] is used as a coagulant in water treatment to remove

A

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

colour
turbidity
bacteria

128
Q

__________ is an ore concentrating metallurgical process involving a chemical change.

A

Roasting

129
Q

Basic oxide is absent in __________ glass.

A

quartz

130
Q

Graphite is a/an

A

both (b) and (c).

allotrope of carbon.
moderator used in nuclear reactor.

131
Q

Nylon-6 is a

A

polyamide

132
Q

Enzymes are

A

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

proteins with high molecular weight (around 10, 000).
derived from living organisms.
catalyst for temperature sensitive reactions.

133
Q

Multistage catalytic converter is not used in the

A

NH3 synthesis reaction.

134
Q

The main product of high temperature carbonisation of coal is

A

coke

135
Q

__________ is a thermosetting plastic.

A

Epoxy polymer

136
Q

In an integrated steel plant, NH3 present in coke oven gas is normally recovered as

A

(NH4)2SO4

137
Q

Flexible foam (for mattresses) is usually made of

A

polyurethanes

138
Q

Glycerine is a by-product of the __________ industry.

A

soap

139
Q

One of the steps during refining of cane sugar consists of addition of hydrated lime to the sugar syrup followed by carbonation of the resulting solution. The purpose of this step is to

A

adjust the pH of the syrup.

140
Q

Permanent hardness of water can be removed by

A

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

addition of soda ash to it.
treating it with zeolites.
passing it through sodium hexametaphosphate.

141
Q

Chalcopyrite is the main ore of

A

copper

142
Q

The end bleaching agent used to move last traces of colour bodies from the pulp is

A

chlorine dioxide (ClO2)

143
Q

Bio-degradable detergents

A

can be readily oxidised.

144
Q
A
145
Q

Sea water contains about __________ ppm of bromine.

A

70

146
Q

Which allotrope of sulphur is insoluble in carbon disulphide ?

A

Plastic sulphur

147
Q

Lubricating greases are a mixture of

A

mineral oil, soap and additives.

148
Q

Metallic soap is __________ salt of fatty acids.

A

aluminium or calcium

149
Q

Cation exchanger is regenerated usually with

A

H2SO4

150
Q

In contact process, SO3 is absorbed in 97% H2SO4 and not in water, because

A

water forms an acid mist, which is difficult to absorb.

151
Q

Bitterns is a/an

A

none of these.

unsaturated fat.
starting material for the production of iodine.
by-product of chlor-alkali industry.

152
Q

The most widely used coagulant for removing suspended impurities from water is

A

alum

153
Q

Main constituent of limestone is

A

CaCO3

154
Q

is obtained as a by-product in the manufacture of sodium hydroxide using brine.

A

Chlorine

155
Q

Fat splitting catalyst is

A

ZnO

156
Q

Phthalic anhydride is used

A

as plasticisers

157
Q

Penicillin is separated from fermented broth by

A

extraction with amyl or butyl acetate.

158
Q

_________ process is used for producing soda ash.

A

Solvay

159
Q

Bleaching powder (chemically known as calcium chloro hypochlorite) is commercially produced by the action of chlorine on

A

slaked lime

160
Q

Which of the following is an unsaturated fatty acid ?

A

Oleic acid

161
Q

The yield of tar from high temperature carbonisation of dry coal is about __________ percent.

A

3

162
Q

__________ is used as a flux in the smelting of copper ore like chalcopyrite.

A

Silica/quartz

163
Q

Phenol formaldehyde is produced by condensation polymerisation. It is also known as

A

bakelite

164
Q

Hydrogenation of oil does not

A

none of these.

165
Q

Main constituents of cotton fiber is

A

cellulose

166
Q

CaCl(OCl) is the chemical formula of

A

bleaching powder

167
Q

Which is the most suitable dye for synthetic fibres ?

A

Acid dye

168
Q

Pick out the wrong statement.

Cold rubber (SBR) is superior as compared to hot rubber (SBR).

Polymerisation temperature can modify the properties of SBR.

Production of cold SBR employs lower pressure as compared to that of hot SBR.

none of these.

A

none of these.

169
Q

Pick out the wrong statement.

Strongly caking coal should not be used in the Lurgi gasifier.

Acetylene gas can not be used for illumination purpose.

Water gas is called blue gas because of the color of the flame, when it is burnt.

Gaseous fuels require less percentage of excess air for combustion as compared to liquid fuels.

A

Acetylene gas can not be used for illumination purpose.

170
Q

Hydrolysis of sugar is called

A

inversion

171
Q

Sulphuric acid completely saturated with sulphur trioxide is called

A

concentrated sulphuric acid.

172
Q

Fish contains about __________ percent oil.

A

20

173
Q

The main aim behind cooling the digested chip at the bottom portion of the digestor by injecting cold black liquor is to

A

avoid mechanical weakening of fibre.

174
Q

Polymethyl methacrylate (PMMA) is known as

A

perspex

175
Q

Coloured glass is obtained by mixing of colored salts. Addition of __________ oxide is done to impart greenish blue color to the glass.

A

copper

176
Q

Percentage of alcohol in beer may be around __________ percent.

A

2-8

177
Q

Which of the following is an ore of iron ?

A

Hematite

178
Q

Which of the following may be viewed as a catalyst in the manufacture of soda ash by Solvay process ?

A

NH3

179
Q

High purity nitrogen is used in

A

both (a) & (b).

making protective gas (95% N2 + 5% H2) for annealing of cold rolled steel strip coils.
fire fighting purposes.

180
Q

Commercial production of soda ash by Solvay process requires limestone, __________ as raw materials.

A

brine and coal

181
Q

Naphthalene is removed from coke oven gas by

A

scrubbing with wash oil.

182
Q

Which of the following is not present in bagasse fibre ?

A

None of these

Cellulose
Lignin
Pentogens

183
Q

Nitric acid is not used in the manufacture of

A

detergents

184
Q

Naphthols are derivates of

A

naphthalene

185
Q

Fermentation is adversely affected by the

A

high concentration.

186
Q

Extraction of __________ employs an electrolytic process.

A

aluminium

187
Q

Dechlorination of treated water is necessary to

A

remove chlorinous taste.

188
Q

Fire clay is __________ refractory material.

A

an acidic

189
Q

An oil is converted into fat by its

A

hydrogenation

190
Q

Production of one ton of cement requires about __________ tons of limestone.

A

1.2

191
Q

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

A

700

192
Q

Shaving soaps are

A

soft potassium soaps (potassium salt of fatty acid) with free stearic acid to give lather a lasting property.

INDIABIX (11 decks)

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