chemical engineering stoichiometry Mcqs
51. A saturated vapor on being compressed would___________________?
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A. Condense

B. Form wet steam

C. Both A. & B.

D. Neither A. nor B.

52. Which of the following holds good for a solution obeying Raoults law (i.e., an ideal solution) (where, ?H = heat of mixing, and ?V = volume change on mixing) ?
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A. ?H = 1 (+ ve) and ? V = -ve

B. ?H = 0

C. ?V = 0

D. Both B. and C.
53. One micron is equal to _____________ cm?
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A. 6-Oct

B. 8-Oct

C. 10-4

D. 2-Oct

54. Boiling point of a non-homogeneous mixture of immiscible liquids is _____________ that of any one of its separate components?
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A. Higher than

B. Lower than

C. Either A. or B.; depends on the liquids

D. Equal to

55. Kopps rule is useful for the determination of_____________________?
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A. Heat capacities of gases

B. Activation energy

C. Heat capacities of solids

D. Molal heat capacities of gases

56. A liquid is in equilibrium with its vapor at its boiling point. On an average, the molecules in the liquid and gaseous phases have equal______________?
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A. Potential energy

B. Kinetic energy

C. Intermolecular forces of attraction

D. Total energy

57. A reduction process is accompanied with increase in the_______________?
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A. Number of electrons

B. Oxidation number

C. Both A. & B.

D. Neither A. nor B.

58. The unit of specific heat at constant pressure, Cp, in SI unit is__________________?
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A. J/m3K

B. W/mK

C. W/m2C

D. J/kgK
59. The unit of dynamic viscosity is_________________?
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A. Stoke

B. Poise

C. gm/cm sec

D. Both B. & C.
60. Simultaneous doubling of the absolute temperature of a gas and reduction of its pressure to half will result in _____________ in the volume of the gas?
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A. No change

B. Doubling

C. Fourfold increase

D. 1/4th reduction

61. The molecular velocity of a real gas is proportional to (where, T = absolute temperature of the gas)?
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A. T2

B. T

C. ?T

D. 1/?T

62. For water evaporating into unsaturated air under adiabatic conditions and at constant pressure, the ____________ remains constant throughout the period of vaporisation ?
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A. Humidity

B. Dry bulb temperature

C. Wet bulb temperature

D. Relative saturation

63. Faster rate of drying of moulded refractories results in high ______________ of refractories?
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A. Green strength

B. Voids

C. Shrinkage

D. Both B. and C.
64. Methane is mixed with stoichiometric proportion of oxygen and completely combusted. The number of additional specifications required to determine the product flow rate and composition is_______________?
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A. 0

B. 3

C. 2

D. 1

65. If the absolute temperature of an ideal gas is tripled and simultaneously the pressure is reduced to one third; then the volume of gas will _______________?
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A. Increase three fold

B. Increase nine fold

C. Remain unaltered

D. Decrease three fold

66. Which form of silica has the highest specific gravity ?
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A. Cristobalite

B. Tridymite

C. Quartz

D. All have the same specific gravity

67. A vapor whose partial pressure is less than its equilibrium vapor pressure is called the _____________ vapor?
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A. Saturated

B. Dry gaseous

C. Superheated

D. Unsaturated

68. The effect of pressure on the heat capacity of the gases ______________ is negligible?
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A. At pressure below one atmosphere

B. Below the critical temperature

C. Both A. & B.

D. Neither A. nor B.

69. For a given mass of a gas at constant temperature, if the volume V becomes three times, then the pressure P will become______________?
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A. 9P2

B. P/3

C. 3P

D. 9P

70. Addition of zircon to silica refractory brick improves its_________________?
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A. Crushing strength

B. Resistance to slag attack

C. Both A. and B.

D. Neither A. nor B.

71. Which of the following is the Clausius-Clapeyron Equation ?
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A. p = [RT/(V b)] (a/TV2)

B. (P + a/V2)(V-b) = RT

C. PV = RT + B/V + y/V2 + .

D. loge (p/p0) = (?/R) (1/T0 1/T)
72. Raoults law states that the equilibrium vapor pressure that is exerted by a component in a solution is proportional to the mole fraction of that component. This generalisation is based on the assumption that the________________?
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A. Component molecules are non-polar and no chemical combination or molecular association

B. Attractive forces between like and unlike molecules are approximately equal

C. Sizes of the component molecules are approximately equal

D. ween unlike molecules takes place in the formation of the solution

E. All A., B. & C.
73. In case of a ternary system involving two liquid components and a solute, the ratio of the concentration of the solute in the two phases at equilibrium is called the distribution co-efficient. The distribution co-efficient depends upon the______________?
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A. Solute concentration

B. Temperature

C. Both A. & B.

D. Neither A. nor B.

74. Viscosity of 1 centipoise is equal to 1 Centistoke in case of________________?
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A. None of these

B. Mercury

C. Water

D. Carbon tetrachloride

75. In a binary liquid solution of components A? and B?, if component A? exhibits positive deviation from Raoults law, then component B? ?
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A. Obeys Raoults law

B. Exhibits positive deviation from Raoults law

C. May exhibit either positive or negative deviation from Raoults law

D. Exhibits negative deviation from Raoults law

76. Weight of 56 litres of ammonia at N.T.P. is _____________ gm?
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A. 42.5

B. 2.5

C. 2800

D. 56

77. Which is not an acidic refractory ?
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A. Carbon black

B. Fireclay

C. High alumina refractory

D. Silica

78. Pick out the wrong unit conversion of heat transfer co-efficient?
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A. 1 BTU/ft2.hr.F = 4.88 kcal/m2.hr.C = 20.44 kJ/m2.hrC = 5.678 W/m2.C

B. 1 kcal/m2.hr.K = 1.163 W/m2.C

C. 1 W/m2.C = 0.1761 BTU/ft2.hr.F.

D. 1 kcal/m2.hr.C = 0.2048 BTU/ft2.hr. F. = 1.163 W/m2.K

79. Avogadros number is equal to__________________?
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A. 6.023 1026 molecules/gm.mole

B. 6.023 1023 molecules/gm.mole

C. 6.023 1016 molecules/kg.mole

D. 6.023 1023 molecules/kg.mole

80. The unit of Cp in S.I. units is___________________?
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A. J/kg.K

B. W/m2.K

C. J/m3. K

D. W/m.K

81. Maximum alumina content in high alumina refractory can be as high as ____________ percent?
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A. 70

B. 30

C. 50

D. 90
82. During a phase change process like sublimation, vaporisation, melting etc., the specific ____________ does not change?
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A. Gibbs free energy

B. Enthalpy

C. Entropy

D. Internal energy

83. For a neutral solution (pH = 7), the value of [H+] [OH-] is equal to_________________?
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A. 0

B. 1

C. 1

84. Outer combustion chamber of blast furnace stove is lined with _______________ bricks?
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A. Fireclay

B. Chrome magnesite

C. Silica

D. Zirconia

85. _____________ kg of CaC03 on heating will give 56 kg of CaO?
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A. 100

B. 1000

C. 56

D. 144

86. The osmotic pressure of a solution increases, if its _____________ is decreased?
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A. Solute concentration

B. None of these

C. Volume

D. Temperature

87. Silica bricks are never used for lining the_________________?
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A. Dome of blast furnace stoves

B. Beehive coke ovens

C. Roof of open hearth furnace

D. By-product coke ovens

88. Real gases approach ideal behaviour at___________________?
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A. High pressure & low temperature

B. Low pressure & high temperature

C. High pressure & high temperature

D. Low pressure & low temperature

89. Beryllia (which is used in making crucibles for melting uranium & thorium) is superior to alumina in all respects for high temperature (> 1900C ) use, except______________?
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A. Cost

B. Fusion point

C. Electrical conductivity

D. Thermal conductivity

90. Unit of power is____________________?
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A. Joule

B. Watt

C. Joule/Second

D. Both B. & C.
91. The vapour pressure of a solution (made by dissolving a solute in a solvent) is ____________ that of the pure solvent?
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A. Equal to

B. Either more or less; depends on the solvent

C. Less than

D. More than

92. Cox chart which is useful in the design of a distillation column (particularly suitable for petroleum hydrocarbons) is a plot of the_____________?
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A. Log (temperature) vs. log (vapor pressure)

B. Temperature vs. log (vapor pressure)

C. Vapor pressure vs. log (temperature)

93. The vapor pressure of a substance, at its melting point, is _____________ in the solid state as compared to that in the liquid state?
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A. Less

B. Either A. or B.; depends on the nature of the substance

C. Same

D. More

94. At higher temperature, molal heat capacities of most of the gases (at constant pressure) ____________ with increase in temperature?
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A. Increases linearly

B. Remains unchanged

C. Increases

D. Decreases

95. In the reaction, Ca + 2H2O = Ca(OH)2 + H2; what volume (c.c.) of hydrogen at STP would be liberated, when 8 gm of calcium reacts with excess water ? (Atomic weight of calcium = 40) ?
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A. 1120

B. 2240

C. 0.4

D. 4480
96. A vessel of volume 1000 m3 contains air which is saturated with water vapour. The total pressure and temperature are 100 kPa and 20C respectively. Assuming that the vapour pressure of water at 20C is 2.34 kPa, the amount of water vapour (in kg) in the vessel is approximately ?
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A. 34

B. 17

C. 20

D. 25

97. One kg of saturated steam at 100C and 1.01325 bar is contained in a rigid walled vessel. It lias a volume of 1.673 m3. It cools to 98C; the saturation pressure is 0.943 bar ; one kg of water vapour under these conditions has a volume of 1.789 m3. The latent heat of condensation (kJ/kg-1 ) under these conditions is___________________?
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A. 2263

B. 40732

C. 2676

D. 540

98. For an ideal gas, the compressibility factor________________?
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A. Is unity at all temperature

B. Zero

C. Is unity at Boyles temperature

D. Decreases with pressure rise

99. Pick out the wrong statement about the recycle stream in a process ?
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A. Recycling in a process does not help in getting higher extent of reaction

B. Recycling is exemplified by refluxing back a part of the distillate to the distillation column to

C. ntity of the same reactant entering the process as fresh feed is called combined feed ratio

D. ntain the quantity of liquid within the column

E. Recycling in a process stream helps in utilising the valuable reactants to the maximum with

F. The ratio of the quantity of a reactant present in the reactor feed of a recycling operation to the

100. The elevation in boiling point of a solution is proportional to the ______________ of the solution?
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A. Molal concentration

B. Normality

C. Reciprocal of the molal concentration

D. Molarity