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

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

None of these
Hot water entering and the cooled water leaving the cooling 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
Molecular diffusion is caused by the

Activation energy of the molecules
Transfer of molecules from low concentration to high concentration region
Potential energy of the molecules
Thermal energy of the molecules

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