Mass Transfer
Relative volatility varies with the concentration of component for an ideal solution. The relative volatity of a binary mixture may be defined as the ratio of vapor pressure of component 'A' to that of component 'B', when

Only liquid phase obeys Dalton's law
Vapor phase obeys Dalton's law and liquid phase obeys Raoult's law
Only vapor phase follows Raoult's law
Liquid phase obeys Dalton's law and vapor phase obeys Raoult's law

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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

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

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

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