Mass Transfer
The amount of steam required per unit quantity of distillate in case of steam distillation will be reduced by

Raising the temperature
Lowering the total pressure
Neither A nor B
Both A & B

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

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