Mass Transfer
Total reflux in a distillation operation requires minimum

Reboiler load
Condenser load
Number of plates
All 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
Solvent of low latent heat of vaporisation 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
Entrainer used in azeotropic distillation should

Form a low boiling azeotrope with one of the constituents of the mixture
Have high latent heat of vaporisation
Have high viscosity to provide high tray efficiency
Form a new azeotrope of low relative volatility with one of the constituents of the mixture

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