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Mass Transfer

Mass Transfer
Gaseous diffusivity at atmospheric pressure is of the order of __________ cm²/second.

1
1 to 5
> 10
5 to 10

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

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

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Mass Transfer
Separation of two volatile liquids by distillation makes use of their

Density difference
Selectivity
Solubility
Relative volatility

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Mass Transfer
Penetration theory relates the average mass transfer co-efficient (K) with diffusivity (D) as

K ∝ D1.5
K ∝ √D
K ∝ D2
K ∝ D

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Mass Transfer
Azeotropic distillation is employed to separate

Constant boiling mixture
Mixture with very high relative volatility
Heat sensitive materials
High boiling mixture

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Mass Transfer
Binary distillation involves the mass transfer by __________ at the gas-liquid interface.

Unidirectional diffusion from gas to liquid phase
A counter diffusion at an almost equal molar rate
Either A or B
Unidirectional diffusion from liquid to gas phase

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