Mass Transfer
In case of physical adsorption, the difference between heat of adsorption and heat of normal condensation is

Equal to the heat of wetting
Zero
Equal to the heat of formation of surface compound
Called integral heat of adsorption

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Mass Transfer
Relative humidity is the ratio of the

Actual humidity to saturation humidity
None of these
Partial pressure of the vapour to the vapour pressure of the liquid at gas temperature
Partial pressure of the vapour to the vapour pressure of the liquid at room temperature

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