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Mass Transfer

Mass Transfer
Mass transfer co-efficient (K) and diffusivity (D) are related according to film theory as

K ∝ √D
K ∝ D
K ∝ D1.5
K ∝ D2

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Mass Transfer
Packed column distillation is limited to the column __________ metres.

Height < 6
Diameter < 0.6
Both A & B
Neither A nor B

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Mass Transfer
Relative volatility does not change appreciably with the change in

Total pressure
Vapour pressure of either component
Temperature
None of these

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Mass Transfer
The relative volatility of a binary mixture at constant temperature __________ the total pressure.

Decreases with increase in
Is independent of
Increases with increase in
None of these

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Mass Transfer
The amount of steam required per unit quantity of distillate in case of steam distillation will be reduced by

Lowering the total pressure
Raising the temperature
Both A & B
Neither A nor B

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Mass Transfer
Pick out the system with minimum boiling azeotrope at 1 atm.

Ethyl alcohol-water
Hydrochloric acid-water
Benzene-toluene
All of these

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