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

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

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

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
Liquid flow increases while the vapor flow decreases for a system

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