Mass Transfer
Relative humidity is the ratio of the

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

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Mass Transfer
When the solvent dissolves very little of solute, then

Solvent of low freezing point should be used
Large quantity of solvent is required to extract the solute
Solvent of low latent heat of vaporisation should be used
Very small quantity of solvent is required

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