Chemical Engineering MCQs

Page No. 183

N.T.P. corresponds to__________________?


a1 atm absolute pressure & 0°C

✓


b 760 mm Hg gauge pressure & 0°C

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c760 torr & 15°C

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d101.325 KPa gauge pressure & 0°C

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‘Giga’ stands for__________________?


a109

✓


b10-12

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c1012

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d1015

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View Answer 109

Gases having same reduced temperatures and reduced pressures_________________?


aDeviate from ideal gas behaviour to the same degree

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bHave nearly the same compressibility factor

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cBoth A. and B.

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dNeither A. nor B.

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View Answer Both A. and B.

According to Raoult’s law, “The vapor pressure exerted by component in a solution is proportional to the mole fraction of that component.” Raoult’s law is not applicable under the following assumption/condition?


aNo component is concentrated at the surface of the solution

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bThe component molecules are non polar and are of almost equal size

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cIn the formation of solution, chemical combination/molecular association between unlike

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dThe attractive forces between like and unlike molecules are almost equal

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The pH value of a solution is 5.9. If the hydrogen ion concentration is decreased hundred times, the solution will be______________?


aBasic

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bMore acidic

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cNeutral

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dOf the same acidity

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View Answer Basic

The activity co-efficient of a solution, which accounts for the departure of liquid phase from ideal solution behaviour________________?


aMeasures the elevation in boiling point

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bIs not dependent on the temperature

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cIs a function of the liquid phase composition

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dMeasures the depression in freezing point

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Size range of the colloids particles is __________________?


a5 – 200 milli-microns

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b 50 – 200 microns

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c500 – 1000 microns

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d10 – 50 Angstrom

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Heat capacity of air can be approximately expressed as, Cp = 26.693 + 7.365 x10-3 T, where, Cp is in J/mole.K and T is in K. The heat given off by 1 mole of air when cooled at atmospheric pressure from 500°C to – 100°C is ____________________?


a10.73 kJ

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b16.15 kJ

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c18.11 kJ

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d18.33 kJ

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View Answer 18.11 kJ

1 kg of calcium carbide (CaC2) produces about 0.41 kg of acetylene gas on treatment with water. How many hours of service can be derived from 1 kg of calcium carbide in an acetylene lamp burning 35 litres of gas at NTP per hour ?


a 5

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b10

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c15

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d20

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View Answer 10

Addition of a non-volatile solute to a solvent produces a ______________ in its solvent?


aFreezing point elevation

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bBoiling point depression

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cVapor pressure lowering

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dAll A., B. & C.

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