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Mass Transfer

Mass Transfer
A good solvent used for absorption should not have very high

Freezing point
Viscosity
All of these
Vapor pressure

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Mass Transfer
What is the reflux ratio at total reflux?

Unity
Infinity
Data insufficient
Zero

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

3 to 4
2.5 to 3
5
1.2 to 1.5

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Mass Transfer
With increase in gas rate, the number of transfer units, NtoG, for a fixed degree of absorption by a fixed amount of solvent

Decreases
Increases
Decreases linearly
Remains unaffected

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Mass Transfer
In a distillation column, with increase in the reflux ratio, the heat removed in the cooler

Decreases
And the heat required in reboiler decreases
Increases
Remains unaffected

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Mass Transfer
A minimum boiling azeotrope is exemplified by

Water-isobutyl alcohol
None of these
Toluene-benzene
Acetone-carbon disulphide

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