Mass Transfer
In which of the following unit operations, the selectivity is an important parameter?

Solvent extraction
Distillation
Absorption
None of these

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Mass Transfer
For the air water system under ambient conditions, the adiabatic saturation temperature and the wet bulb temperature are nearly equal, because

They are always equal under all circumstances
Lewis number is close to unity
Solubility of the components of air in water is very small
Water has a high latent heat of evaporation

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Mass Transfer
In an operating distillation column, the

Driving force for the vapor flow is the pressure drop, as the pressure decreases gradually from the bottom to the top of the column
Highest temperature is encountered at the top of the column
Driving force for the liquid flow is its specific weight
Vapors and liquids are at their dew point and bubble point respectively

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