Mass Transfer
In extraction, as the temperature increases, the area of hetrogeneity (area covered by binodal curve)

Remains unchanged
Increases
None of these
Decreases

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

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Mass Transfer
In an operating distillation column, the

Highest temperature is encountered at the top of the column
Driving force for the liquid flow is its specific weight
Driving force for the vapor flow is the pressure drop, as the pressure decreases gradually from the bottom to the top of the column
Vapors and liquids are at their dew point and bubble point respectively

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Mass Transfer
Fenske's equation for determining the minimum number of theoretical stages in distillation column holds good, when the

Multicomponent distillation is involved
Mixture (to be separated) shows negative deviation from ideality
Relative volatility is reasonably constant
Mixture (to be separated) shows positive deviation from ideality

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Mass Transfer
Priming in a distillation column

Is desirable from point efficiency consideration
Reduces the overall pressure drop
Results from very low gas velocity
Is characterised by the presence of foam throughout the space between trays

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