Mass Transfer
Total reflux in a distillation operation requires minimum

Number of plates
All of these
Reboiler load
Condenser load

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Mass Transfer
In case of an absorber, the operating

Line always lies above the equilibrium curve
Line always lies below the equilibrium curve
Line can be either above or below the equilibrium curve
Velocity is more than the loading velocity

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

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