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Mass Transfer

Mass Transfer
Selectivity of the solvent used in solvent extraction should be

1
> 1
< 1

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Mass Transfer
As complete saturation of an adsorbent is approached, the differential heat of adsrop-tion approaches

Integral heat of adsorption
That of normal condensation
None of these
Zero

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Mass Transfer
In which of the following unit operations, the selectivity is an important parameter?

Absorption
Solvent extraction
Distillation
None of these

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Mass Transfer
Cox chart is useful in the design of

Crystalliser
Dryer
Evaporator
Distillation column

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Mass Transfer
For the gas absorption, the height of a transfer unit, based on the gas phase is given by (G: superficial molar gas velocity, L: superficial molar liquid velocity, FG:mass transfer co-efficient, mols/m² , a: in-terfacial area per unit volume of tower)

FG/(G.a)
(G.a)/FG
L/(FG.G)
F/(FG.a)

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Mass Transfer
Absorption accompanied by heat evolution results in

Increase in equilibrium solubility
None of these
Decrease in equilibrium solubility
Increased capacity of the absorber

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