Mass Transfer
The term "cooling range" in a cooling tower refers to the difference in the temperature of

Cold water leaving the tower and the wet bulb temperature of the surrounding air
Hot water entering the tower and the wet bulb temperature of the surrounding air
None of the listed here
Hot water entering the tower and the cooled water leaving the tower

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

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
Solvent of low freezing point should be used

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Mass Transfer
Steam distillation is used to

Reduce the number of plates
Increase the efficiency of separation
Increase the total pressure of distillation
Avoid thermal decomposition of a component

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