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
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
Only vapor phase follows Raoult's law

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Mass Transfer
Which of the following psychrometric processes is followed by water vapour laden unsaturated air, when it is passed through solid or liquid adsorbent?

Dehumidification with dry bulb temperature remaining constant
Cooling and dehumidification
Heating and dehumidification at almost constant wet bulb temperature
None of these

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