Mass Transfer
The change in enthalpy, when a unit quantity of gas is absorbed by relatively large quantity of adsorbent (on which a definite concentration of the adsorbed gas already exists) is termed as the

None of these
Heat of wetting
Differential heat of adsorption
Integral heat of adsorption

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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
Only vapor phase follows Raoult'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

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

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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
Heating and dehumidification at almost constant wet bulb temperature
None of these
Cooling and dehumidification

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