Mass Transfer
Molecular diffusivity of a liquid

Increases with temperature
Is independent of temperature
May increase or decrease with temperature
Decreases with temperature

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Mass Transfer
In saturated gas, the

Vapour is in equilibrium with the liquid at the gas temperature
None of the listed here
Vapour is in equilibrium with the liquid at the room temperature
Partial pressure of vapour equals the vapour pressure of the liquid at room temperature

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Mass Transfer
Steam distillation is not recommended to be used, if the

Material to be distilled is thermally unstable or has the tendency to react with other components associated with it, at the boiling temperature
Azeotropic mixture is to be separated and the final product is miscible with water
Liquids decompose, if distilled directly at atmospheric pressure
Material can not be distilled by indirect heating even under low pressure, because of the high boiling temperature

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