Mass Transfer
Binary distillation involves the mass transfer by __________ at the gas-liquid interface.

Unidirectional diffusion from liquid to gas phase
Either A or B
Unidirectional diffusion from gas to liquid phase
A counter diffusion at an almost equal molar rate

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Mass Transfer
As the reflux ratio in a distillation coloumn is increased from the minimum, the

Liquid flow increases while the vapor flow decreases for a system
Total cost first decreases and then increases
Slope of the operating line in stripping section decreases
Number of plates decreases very slowly first and then more and more rapidly

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

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