Mass Transfer
Chemisorption (chemical adsorption) is

A reversible phenomenon
Same as "Van der Waals" adsorption
An irreversible phenomenon
Characterised by adsorption of heat

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Mass Transfer
The wetted wall tower is used to determine

The overall M.T.C. of the system
M.T.C. of liquid in liquid-gas system
M.T.C. of individual components in a liquid-liquid system
Individual mass transfer co-efficient (M.T.C.) in gaseous system

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Mass Transfer
In case of steam distillation, the steam leaving the liquid is not completely saturated with distillate vapour, because

Temperature is less
Mixing of steam with the material being vaporised is not so intimate as to result in equilibrium condition
Saturated steam is used for steam distillation
Total pressure is less

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