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

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

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Mass Transfer
Solvent extraction is the terminology applied to the liquid-liquid extraction, which is preferred for the separation of the components of liquids, when

One of the liquid components has very high affinity towards the solvent
Viscosity of liquid components is very high
Extracting solvent is cheaply & abundantly available
One of the liquid components is heat sensitive

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Mass Transfer
When acetone is added in a two layer mixture of methyl isobutyl ketone and water at 30°C, the acetone distributes between the two layers and the composition of the layer follows two solubility curves. For this system,

The distribution curve which is a plot between x (acetone concentration in one phase) and y (acetone concentration in other phase) is analogous to x-y curve used in distillation and absorption termina
All of these
As the acetone concentration increases, the solubility curves approach each other
Both the phases become identical at a particular common point on both the solubility curves called the plait point

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