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Reviewer C > Chemical Process > Flashcards

Chemical Process Flashcards

1
Q

Oxidation of SO2 to SO3 is favoured by

A

low temperature and high pressure.

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2
Q

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

A

salt petre

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3
Q

Starting raw material for the manufacture of alum is

A

bauxite

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4
Q

Paper pulp produced by kraft/sulphate process is

A

strong fibrous

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5
Q

Claude process of gas liquefaction employs

A

adiabatic expansion against a piston or in a turbine.

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6
Q

The main use of HCl is in the

A

drilling of petroleum wells and pickling of steel sheets.

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7
Q

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

A

Endothermic

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8
Q

Viscose rayon is chemically

A

regenerated cellulose acetate

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9
Q

The combustion reaction, C + O2 = CO2, is

A

exothermic

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10
Q

Styrene is produced from ethyl benzene by the process of

A

dehydrogenation

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11
Q

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

A

callagen

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12
Q

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

A

15 - 20

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13
Q

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

A

oleum

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14
Q

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

A

50

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15
Q

Which of the following is the most adverse factor challenging the choice of mercury electrolytic cell process for the production of caustic soda?

A

Pollution of water stream by mercury.

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16
Q

Neoprene is the trade name of

A

polychloroprene

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17
Q

Sulphur addition in soap is done to

A

cure pimples & dandruff.

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18
Q

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

A

Iron oxide

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19
Q

In sulphate pulp manufacture, the pressure and temperature in the digestor is

A

10 atm., 170-180°C

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20
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

A

sodium chloride

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21
Q

Pasteurisation of milk means

A

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

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22
Q

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

A

Solvay

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23
Q

Polycaprolactum is commercially known as

A

nylon-6

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24
Q

Frasch process is for

A

Mining sulfur

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25
Q

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

A

Coagulation

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26
Q

Pitch (a product of coal tar distillation) is always mixed with creosote oil, when it is to be burnt in a burner, because

A

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

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27
Q

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

A

CO

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28
Q

The drug used in contraceptives is

A

mestranol

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29
Q

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

A

white

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30
Q

In the Lurgi coal gasifier

A

large quantity of coal can be processed.

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31
Q

Neon gas is

A

used in color discharge tube.

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32
Q

Calgon used in water treatment is chemically

A

sodium hexametaphosphate

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33
Q

Which oil is preferred for paint manufacture ?

A

Drying oil

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34
Q

Ethylene oxide is produced by oxidation of ethylene in presence of AgO catalyst at

A

5 atm & 275°C

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35
Q

Cumene is the starting material for the production of

A

phenol and acetone

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36
Q

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

A

Flint

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37
Q

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

A

Vanadium

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38
Q

Most commonly used rubber vulcanising agent is

A

sulphur

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39
Q

Free alkali in a toilet soap is __________ that in a laundary shop.

A

less than

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40
Q

Dehydrogenation of isopropanol produces

A

acetone

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41
Q

Concentration of hydrogen peroxide is done by

A

vacuum crystallisation

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42
Q

Helium is produced on commercial scale from

A

natural gas

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43
Q

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

A

20 - 30

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44
Q

The catalyst used in the manufacture of DDT is

A

20% oleum.

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45
Q

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

A

Alum

46
Q

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

A

Sodium sulphate

47
Q

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

A

Gypsum

48
Q

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

A

Baking powder

49
Q

Oils are partially hydrogenated (not fully) to manufacture vanaspati, because fully saturated solidified oils

A

cause cholesterol build up and blood clotting

50
Q

Raw materials for ‘Solvay Process’ for manufacture of the soda ash are

A

salt, limestone and coke or gas

51
Q

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

A

low co-efficient of expansion.

52
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.

A

< 10

53
Q

Absorption of SO3 in 97% H2SO4 is

A

exothermic

54
Q

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

A

Ostwald’s

55
Q

Sulphuric acid solution having a specific gravity of 1.20 at room temperature is used mainly for the

A

car battery solution

56
Q

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

A

alumina

57
Q

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

A

brine

58
Q

Phenol formaldehyde resin is used as an adhesive in making

A

laminates

59
Q

Catalyst used in the manufacture of sulphuric acid by chamber & contact processes are respectively

A

oxides of nitrogen & V2O5 on a porous carrier.

60
Q

Which of the following processes does not produce Cl2 as a co-product during the manufacture of caustic soda ?

A

Lime-soda process

61
Q

Bleaching action of bleaching powder is due to its __________ properties

A

oxidising

62
Q

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

A

Nitric acid

63
Q

Lime and soda ash are added to water to remove

A

bicarbonates & sulphates of calcium and magnesium.

64
Q

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

A

shift conversion.

65
Q

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

A

recuperator

66
Q

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

A

Cl2

67
Q

Plasticisers are added to paints to

A

give elasticity & prevent cracking of the film.

68
Q

Cumene (isopropyl benzene) is made by

A

propylene alkylation of benzene

69
Q

Mannheim furnace is used in the manufacture of

A

hydrochloric acid

70
Q

Black liquor is converted into white liquor by

A

evaporation and burning the concentrate followed by causticisation of products.

71
Q

Polymerisation product of C2F4 (carbon tetraflouride) is called P.T.F.E (poly chloro tetra flouro ethylene). It is also called

A

teflon

72
Q

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

A

methyl alcohol

73
Q

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

A

roasting

74
Q

Deacon’s method is used for the manufacture of

A

chlorine

75
Q

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

A

borosilicate

76
Q

Transportation of 35% oleum during winter suffers from the problem of freezing, which can be overcome by the addition of small quantity of

A

nitric acid

77
Q

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

A

black

78
Q

Which of the following processes can remove both temporary as well as permanent hardness of water ?

A

Distillation

79
Q

Rancidity of the fatty oil can be reduced by its

A

hydrogenation

80
Q

Boiling of water containing temporary hardness produces

A

CO2

81
Q

Starting material for the commercial production of ethyl alcohol in India is

A

molasses

82
Q

Shrinkage volume in cement setting does not depend upon the

A

sand to cement ratio.

83
Q

Bisphenol A is produced by the condensation of acetone with

A

phenol

84
Q

At a given temperature, the equilibrium yield of SO3 obtained from the oxidation of SO2 is proportional to (where, P = pressure of the system )

A

√P

85
Q

20% oleum means that in 100 kg oleum, there are 20 kg of

A

SO3 and 80kg of H2SO4.

86
Q

Glycerine is recovered from lye by

A

evaporation followed by vacuum distillation.

87
Q

Enzymes are organic catalysts used in the __________ reactions

A

biochemical

88
Q

Linde process of gas liquefaction employs

A

adiabatic expansion through a throttle valve (Joule-Thomson expansion).

89
Q

Cellulose content of bamboo and ideal fibrous raw material for the manufacture of paper is __________ percent.

A

50

90
Q

Ore concentration by froth floatation utilises the __________ of ore particles.

A

wetting characteristics

91
Q

The main use of activated carbon in water treatment is to control

A

taste and odour

92
Q

The most commonly used substance to speed up the sedimentation of sewage is

A

lime

93
Q

Sugar content in sugarcane on cane basis is about __________ percent by weight.

A

5 to 10

94
Q

The major use of butadiene is

A

in the manufacture of synthetic rubber.

95
Q

The manufacture of Kraft pulp is done by a/an __________ process.

A

alkaline

96
Q

Antibiotic

A

inhibits/destroys the growth of microorganisms.

97
Q

Industrial production of chloroform requires acetone and

A

calcium hypochlorite

98
Q

Pencillin, an antibiotic drug was discovered by

A

Alexender

99
Q

Styrene (a monomer for the production of polystyrene) is commercially produced by

A

catalytic dehydrogenation of ethyl benzene.

100
Q

Fatty material used in soap making is

A

Tallow

101
Q

glass is used for the manufacture of optical glass.

A

Flint

102
Q

Favourable conditions for the liquefaction of gases in general are

A

high pressure & low temperature.

103
Q

In the manufacture of sulphuric acid from elemental sulphur, the following sequence of major operations is followed :

A

furnace → converter → absorber

104
Q

is an ore of lead.

A

Galena

105
Q

Catalytic oxidation of toluene produces

A

phenol

106
Q

SO2 is bubbled through hot sugar cane juice to

A

act as an acidifying agent.

107
Q

The noble gas which occurs most abundantly in the atmosphere is

A

argon

108
Q

Production of alcohol by fermentation of molasses is an __________ process.

A

aerobic

109
Q

Main constituents of portland cement are calcium aluminate and

A

Silicates.

110
Q

Common salt is generally not produced commonly by __________ method from brine.

A

Freeze drying

Reviewer C (19 decks)

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