Mass Transfer
With increase in temperature, the rate of leaching increases, because the

Thermal conductivity of solute increases
Viscosity of solvent decreases
None of these
Diffusivity of solute increases

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Mass Transfer
Relative humidity is the ratio of the

Actual humidity to saturation humidity
Partial pressure of the vapour to the vapour pressure of the liquid at gas temperature
Partial pressure of the vapour to the vapour pressure of the liquid at room temperature
None of these

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

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
None of these
Cold water leaving the tower and the wet bulb temperature of the surrounding air

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