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


c760 torr & 15°C


d101.325 KPa gauge pressure & 0°C



‘Giga’ stands for__________________?


a109


b10-12


c1012


d1015


View Answer 109

Gases having same reduced temperatures and reduced pressures_________________?


aDeviate from ideal gas behaviour to the same degree


bHave nearly the same compressibility factor


cBoth A. and B.


dNeither A. nor B.


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


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


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


dThe attractive forces between like and unlike molecules are almost equal



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


aBasic


bMore acidic


cNeutral


dOf the same acidity


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


bIs not dependent on the temperature


cIs a function of the liquid phase composition


dMeasures the depression in freezing point



Size range of the colloids particles is __________________?


a5 – 200 milli-microns


b 50 – 200 microns


c500 – 1000 microns


d10 – 50 Angstrom



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


b16.15 kJ


c18.11 kJ


d18.33 kJ


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


b10


c15


d20


View Answer 10

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


aFreezing point elevation


bBoiling point depression


cVapor pressure lowering


dAll A., B. & C.



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