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

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

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Mass Transfer
In saturated gas, the

Partial pressure of vapour equals the vapour pressure of the liquid at room temperature
Vapour is in equilibrium with the liquid at the room temperature
None of the listed here
Vapour is in equilibrium with the liquid at the gas temperature

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