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
Very small quantity of solvent is required
Large quantity of solvent is required to extract the solute

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Mass Transfer
Inside the distillation column, the

Liquids are not always at their bubble points
None of these
Driving force for the vapour flow is the pressure drop
Pressure increases gradually from bottom to the top of the column

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