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Mass Transfer

Mass Transfer
If Rm is the minimum reflux ratio, the optimum reflux ratio may be around __________ Rm.

5
1.2 to 1.5
2.5 to 3
3 to 4

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Mass Transfer
Smoke is an example of

Solid dispersed in gas
Liquid dispersed in gas
Solid dispersed in liquid
Gas dispersed in liquid

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Mass Transfer
Freundlich equation applies to the adsorption of solute from

Dilute solutions, over a small concentration range
None of these
Concentrated solutions
Gaseous solutions at high pressure

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Mass Transfer
The diffusivity (D) in a binary gas mixture is related to the temperature (T) as

D ∝ T1.5
D ∝ T
D ∝ T0.5
D ∝ T2

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Mass Transfer
If mass diffusivity in a mixture is equal to the thermal diffusivity, then the Lewis number is

> 1
< 1
1

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Mass Transfer
Agitator is provided in a crystalliser for

All of these
Avoiding deposition on cooler surfaces
Crystal growth
Formation of nuclei

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