Mass Transfer
Which one of the following devices is not used for both the absorption as well as the liquid-liquid extraction processes?

Wetted wall columns
Plate towers
Packed towers
Spray towers

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

Very small quantity of solvent is required
Solvent of low latent heat of vaporisation should be used
Solvent of low freezing point should be used
Large quantity of solvent is required to extract the solute

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Mass Transfer
Humid volume is the total volume in m³ of 1 kg of

Gas plus its accompanying vapour at 1 atm. and gas temperature
Vapour laden gas at 1 atm. and gas temperature
Vapour laden gas at 1 atm. and room temperature
Gas plus its accompanying vapour at 1 atm. and room temperature

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