Chemical Engineering MCQs

Page No. 415

In case of vapor-liquid equilibria, which of the following does not account for gas phase deviation from ideality ?


aUse of equation of state


bFugacity co-efficient


cActivity co-efficient


dNone of these


View Answer Activity co-efficient

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


aLess


bMore


cSame


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


View Answer Same

The increase in the temperature of the aqueous solution will result in decrease of its________________?


aWeight % of the solute


bMole fraction of the solute


cMolarity


dMolality


View Answer Molarity

Raoult’s 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________________?


aSizes of the component molecules are approximately equal


bAttractive forces between like and unlike molecules are approximately equal


cComponent molecules are non-polar and no chemical combination or molecular association between unlike molecules takes place in the formation of the solution


dAll A., B. & C.


View Answer All A., B. & C.

1 gm mole of an alcohol whose molecular weight is 74 contains 48 gms of carbon, 10 gms of hydrogen and 16 gms of oxygen. Its molecular formula is__________________?


aC4H9OH


bC3H21OH


c(C2H4)2H2.OH


dC2H33OH


View Answer C4H9OH

Variation of vapor pressure with temperature can be calculated using Clausius-Clapeyron equation, which assumes that the________________?


aVapor follows the ideal gas law


bMolal latent heat of vaporisation is constant within the limited temperature range


cVolume in the liquid state is negligible compared with that in the vapor state


dAll A., B. & C.


View Answer All A., B. & C.

Which of the following expressions defines the Baume gravity scale for liquids lighter than water ?


a°Be = (140/G) – 130


b°Be = 200(G-1)


c°Be = 145 – (145/G)


d°Be = (400/G) – 400



For any system, the _____________ heat of solution is dependent on the temperature and the adsorbate concentration?


aIntegral


bIntegral


cBoth A. & B.


dNeither A. nor B.


View Answer Both A. & B.

Pick out the wrong unit conversion of thermal conductivity ?


a1 BTU/ft2.hr.°F/ft = 1.488 kcal/m2. hr.°C/m


b1 BTU/ft2.hr.°F/inch = 1.488 kcal/m2. hr.°C/m


c1 kcal/m.hr.°C = 0.672 BTU/ft.hr.°F = 1.163 W/m. °K


d1 W/cm.°C = 85.985 kcal/m.hr.°C = 57.779 BTU/ft.hr.°F



Pure aniline is evaporating through a stagnant air film of 1 mm thickness at 300 K and a total pressure of 100 KPa. The vapor pressure of aniline at 300 K is 0.1 KPa. The total molar concentration under these conditions is 40.1 mole/m3. The diffusivity of aniline in air is 0.74 × 10-5m2/s. The numerical value of mass transfer co-efficient is 7.4 × 10-3. Its units are_______________________?


am/s


bcm/s


cmole/m2.s.Pa


dk.mole/m2.s.Pa


View Answer mole/m2.s.Pa

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