chemical engineering chemical process Mcqs
51. Favourable conditions for the liquefaction of gases in general are _____________________?
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A. High pressure & high temperature

B. Low pressure & high temperature

C. High pressure & low temperature

D. Low pressure & low temperature

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

B. P

C. P2

D. 1/P

53. Contact process of sulphuric acid manufacture ____________________?
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A. Yields acids of lower concentration than chamber process

B. Is obsolete

C. Eliminates absorber

D. Yields acid of higher concentration than chamber process
54. Carbon disulphide is mainly used in the production of______________________?
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A. Paints

B. Viscose rayon

C. Corundum

D. Plasticiser for unsaturated polyester

55. Styrene (a monomer for the production of polystyrene) is commercially produced by ____________________?
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A. Fermentation of starch

B. Reacting ethylene oxide with acetaldehyde

C. Dehydration of ethyl alcohol followed by hydrogenation

D. Catalytic dehydrogenation of ethyl benzene
56. Widely used method for the conditioning of boiler feed water is the ___________________?
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A. Hot-lime soda process

B. Sequestration

C. Coagulation

D. Cold lime process

57. Maleic anhydride is produced by catalytic oxidation of____________________?
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A. Naphthalene

B. Benzene

C. Ethyl alcohol

D. Toluene

58. Blue colour is imparted to glass by the addition of__________________?
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A. CaO

B. FeSO4

C. NaOH

D. PbO

59. Sea water contains about ______________________ ppm of bromine ?
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A. 5

B. 1700

C. 500

D. 70
60. Shaving soaps are____________________?
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A. Metallic soaps compounded with frothing agents

B. Soft potassium soaps (potassium salt of fatty acid) with free Stearic acid to give lather a

C. High free alkali soaps having excess of cane sugar and alcohol

D. ting property</strong>

E. None of these

61. Carboxymethyl cellulose (CMC) is added in detergents to_________________?
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A. Prevent redeposition of soil on cleaned surface

B. Inhibit corrosion in washing machines made of aluminium

C. None of these

D. Act as optical brightening agent

62. Nylon-6 as compared to Nylon-66 is having higher___________________?
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A. Abrasion/resistance

B. Hardness

C. None of these

D. Melting point

63. Presence of carbonaceous matter in the sewage____________________?
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A. Reduces sulphate ions to sulphides causing obnoxious smell

B. Increases the quantity of chlorine used for its purification

C. Causes reduction in its dissolved oxygen content thereby endangering the life of aquatic

D. All A, B. and C.

E. atures

64. Cellulose content of bamboo and ideal fibrous raw material for the manufacture of paper is ______________ percent?
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A. 95

B. 80

C. 10

D. 50
65. Nitrile rubber is produced by the polymerisation of__________________?
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A. Isobutylene and isoprene

B. Acrylonitrile and butadiene

C. None of these

D. Acrylonitrile and styrene

66. Which of the following impurities in feed water for high pressure boiler is the most detrimental ?
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A. Dissolved salt

B. Suspended salt

C. Silica

D. Dissolved oxygen

67. Which of the following is an explosive ?
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A. All A , B., and C.

B. Trinitrotoluene (TNT)

C. Nitro-glycerine

D. Cellulose nitrate

68. Reaction of calcium carbide with water produces a gas, which is used_________________?
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A. As an illuminant

B. For metal cutting/welding

C. Both A. & B.

D. Neither A. nor B.

69. Which one of the following is not an elastomer ?
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A. Neoprene

B. Nitrile-butadiene

C. Polyisoprene

D. None of these
70. The compressive strength of cement should not be less than about 110Kg/cm2 after three days & not less than 170Kg/cm2 after seven days. The fineness of an ordinary cement as determined by turbidimetric method should be about ________________ cm2/gm?
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A. 1600

B. 4000

C. 8500

D. 800

71. Low temperature carbonisation of coal takes place at _______________ C ?
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A. 300

B. 1100

C. 700

D. 900

72. Which of the following is not present in bagasse fibre ?
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A. None of these

B. Pentogens

C. Cellulose

D. Lignin

73. Plasticisers are added to synthetic plastics to____________________?
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A. Improve workability during fabrication

B. Impart flexibility

C. Develop new improved properties not present in the original resins

D. All A, B. and C.
74. The manufacture of Kraft pulp is done by a/an _________________ process?
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A. Alkaline

B. None of these

C. Acidic

D. Neutral

75. Concentration of NaOH solution produced by diaphragm electrolytic cell is about _______________ percent?
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A. 25

B. 10

C. 98

D. 50

76. Catalytic oxidation of toluene produces____________________?
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A. Styrene

B. Tri-nitro-toluene

C. Phenol

D. Benzene

77. Phenol formaldehyde is produced by condensation polymerisation. It is also known as_____________________?
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A. Teflon

B. Bakelite

C. Polyester

D. Nylon-66

78. Carborundum consists mainly of_________________?
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A. Boron carbide

B. Silicon carbide

C. Calcium carbide

D. Bauxite

79. Which of the following processes can remove both temporary as well as permanent hardness of water ?
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A. Boiling

B. Distillation

C. Filtration

D. None of these

80. In an integrated steel plant, NH3 present in coke oven gas is normally recovered as_________________?
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A. (NH4)2SO4

B. NH4Cl

C. (NH4)2 NO3

D. Liquid NH3

81. Acrylonitrile is mainly used in the _____________ industry?
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A. Polymer

B. Dyeing

C. Photographic

D. Printing

82. Economics of Solvay Process depends upon the efficiency of __________________?
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A. Ammonia recovery

B. Ammonia recovery and size of the plant

C. Ammoniation of salt solution

D. Carbonating tower

83. Molecular weights of polymers are in the range of__________________ ?
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A. 102 102

B. 102 107

C. 105 109

D. 109 1011

84. Temperature during hydrogenation of oil should not be more than 200C, otherwise it will result in______________________?
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A. All A, B. and C.

B. Pyrolysis of oil

C. Sintering of porous catalyst

D. Hydrogen embrittlement

85. 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_____________________?
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A. Sodium chloride

B. Sodium sulphate

C. Calcium sulphate

D. Magnesium chloride

86. Molecular weight of plastics ranges from ______________________?
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A. 20000 to 250000

B. 5000 to 10000

C. 106 to 109

D. 500 to 5000

87. Pig iron is produced by blast furnaces in India using mostly the iron ore named _______________?
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A. Hematite

B. Chalcopyrite

C. Siderite

D. Magnetite

88. Air used in aerobic fermentation must be sterilized, otherwise the ___________________?
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A. Recovery of product will be difficult

B. None of these

C. Contamination of pure culture would result

D. Uniformity of product cannot be achieved

89. Lime and soda ash are added to water to remove ___________________?
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A. Its corrosiveness

B. Bacteria

C. Undesirable taste and odour

D. Bicarbonates & sulphates of calcium and magnesium
90. ______________ is an ore concentrating metallurgical process involving a chemical change?
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A. Froth floatation

B. Roasting

C. Electromagnetic separation

D. None of these

91. Sulphuric acid saturated with SO3 is called_________________?
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A. Oleum

B. Sulphurous acid

C. Concentrated H2SO4

D. None of these

92. Bordeaux mixture is a/an________________?
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A. Inorganic fungicide

B. Insecticide

C. Fertiliser

D. Explosive

93. Deacons method is used for the manufacture of____________________?
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A. Common salt

B. Chlorine

C. Glaubers salt

D. Graphite electrode

94. Which of the following processes does not produce Cl2 as a co-product during the manufacture of caustic soda ?
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A. None of these

B. Diaphragm electrolytic cell process

C. Lime-soda process

D. Mercury electrolytic cell process

95. Major component of flint glass is_____________________?
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A. Lead oxide

B. Silica

C. Alumina

D. Soda

96. Hydrazine (N2H4) is used mainly as a/an__________________?
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A. None of these

B. Explosive

C. Detergents additive

D. Rocket fuel
97. Gun powder, which is an explosive comprises of charcoal, sulphur and____________________?
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A. Glycerine

B. Nitro glycerine

C. Dynamite

D. Salt petre
98. Solvay process is used for the manufacture of____________________?
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A. Soda lime

B. Caustic soda

C. Soda ash

D. Caustic potash

99. Bleaching action of bleaching powder is due to its _____________ properties ?
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A. Oxidising

B. Disinfecting

C. None of these

D. Reducing

100. Rancidity of the fatty oil can be reduced by its__________________?
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A. Decoloration

B. Hydrogenation

C. Oxidation

D. Purification