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Mass Transfer

Mass Transfer
The binary diffusivity in gases and liquids vary respectively as

T and T3/2
T3/2 and √T
T3/2 and T
√T and T3/2

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Mass Transfer
For a fixed number of ideal stages in a distillation column, as the reflux ratio is increased, the difference in composition between the top and bottom product streams

Passes through a maximum
Decreases
Increases
Remains unaffected

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Mass Transfer
Which of the following operations does not involve leaching?

Removing nicotine from its water solution by kerosene
Dissolving gold from ores
Dissolving pharmaceutical products from bark or roots
Dissolving sugar from the cells of the beet

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Mass Transfer
When the mixture to be distilled has a very high boiling point and the product material is heat sensitive, the separation technique to be used is __________ distillation.

Continuous
None of these
Azerotropic
Steam

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Mass Transfer
Extraction of coffee from its seed is done by

Leaching
Steam distillation
Extractive distillation
Liquid-liquid extraction

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Mass Transfer
Absorption factor, for a fixed degree of absorption from a fixed amount of gas should be

≤ 1
1
< 1
> 1

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