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

Vapor phase obeys Dalton's law and liquid phase obeys Raoult's law
Only liquid phase obeys Dalton'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
Solvent extraction is the terminology applied to the liquid-liquid extraction, which is preferred for the separation of the components of liquids, when

One of the liquid components is heat sensitive
One of the liquid components has very high affinity towards the solvent
Viscosity of liquid components is very high
Extracting solvent is cheaply & abundantly available

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Mass Transfer
In saturated gas, the

Vapour is in equilibrium with the liquid at the gas temperature
None of the listed here
Partial pressure of vapour equals the vapour pressure of the liquid at room temperature
Vapour is in equilibrium with the liquid at the room temperature

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