Mass Transfer
Unsaturated air (with dry bulb and wet bulb temperatures being 45°C and 25°C respectively) is passed through a water spray chamber maintained at 23°C. The air will be cooled and

None of these
Humidified with wet bulb temperature decreasing
Humidified at constant wet bulb temperature
Dehumidified

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

Solvent of low freezing point should be used
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

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