Mass Transfer
In distillation, overhead product contains

Two components
Only saturated liquid
Any number of components
Only one component

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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
Number of plates decreases very slowly first and then more and more rapidly
Total cost first decreases and then increases
Slope of the operating line in stripping section decreases

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Mass Transfer
When the liquid phase and vapour phase of a binary system obeys Raoult's and Dalton's law respectively, the relative volatility is the ratio of

Vapour pressure of component A to the partial pressure of A
Vapour pressure of component A to that of component B
Vapour pressure of component A to the total pressure
Partial pressure of component A to the total pressure

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