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Mass Transfer

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

1
5 to 10
> 10
1 to 5

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Mass Transfer
______ extractor uses centrifugal force for separating the two phases.

Treybal
None of the listed here
Schiebel
Podbielniak

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Mass Transfer
Separation of a mixture of two gases by absorption in the liquid solvent depends upon the difference in their

Density
Relative volatility
Solubility
Viscosity

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

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

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Mass Transfer
For a binary mixture with low relative volatility,

Use molecular distillation
Use steam distillation
Use high pressure distillation
An azeotrope may be formed during distillation

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Mass Transfer
In distillation column design, the McCabe-Thiele procedure is inadequate and a Ponchan-Savarit procedure is needed, when

An azeotrope forms
A total condenser is used
Saturated feed is not used
The latent heat of vaporisation of the more and less volatile components are greatly different

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