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

Solvent extraction
None of these
Distillation
Absorption

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Mass Transfer
In a counter-current liquid extractor

Only one of the liquids may be pumped at any desired rate
Liquid's flow rate depends upon the temperature and pressure
Both liquids can have any desired flow rate
Both liquids flow at fixed rate

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Mass Transfer
Dew point of an air-water vapor mixture

At constant humidity & total pressure is fixed
Corresponding to any point on the humidity chart is obtained by projecting a line through this point parallel to the temperature axis and to the saturation curve
Decreases with decrease in pressure
All of the listed here

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