Mass Transfer
Plate towers are preferred to packed towers, when large temperature changes are involved, because of the reason that the

None of these
Packing may be crushed due to thermal expansion/contraction of the components of the equipments
Viscosity variation of the fluids may cause channeling/flooding
Pressure drop in the equipment will be very high

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Mass Transfer
Entrainer used in azeotropic distillation should

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

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Mass Transfer
In a counter-current liquid extractor

Both liquids can have any desired flow rate
Both liquids flow at fixed rate
Only one of the liquids may be pumped at any desired rate
Liquid's flow rate depends upon the temperature and pressure

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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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