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Mass Transfer

Mass Transfer
__________ equation applies to diffusivities in liquids.

Hirschfelder
None of these
Wilke and Chang
Gilliland

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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

Remains unaffected
Increases
Decreases
Passes through a maximum

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Mass Transfer
The fixed cost of a distillation column at minimum reflux ratio is

None of these
Optimum
Infinite
Minimum

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

Density difference
Solubility
Relative volatility
Selectivity

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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
Decreases linearly
Increases
Remains unaffected

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Mass Transfer
In extractive distillation, solvent is

Present in overhead stream
Of high volatility
Of high viscosity to give high tray efficiency
Added to alter the relative volatility of the mixture

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