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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
T and T3/2
T3/2 and √T

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Mass Transfer
In case of gases, the binary diffusivity is proportional to (where, P = pressure)

1/√P
1/P
P
√P

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

D ∝ 1/P0.5
D ∝ P0.5
D ∝ 1/P1.5
D ∝ 1/P

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

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

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Mass Transfer
High pressure at the bottom of a distillation tower handling heat sensitive materials results in

Erosion of the tower
Very efficient operation
Thermal decomposition of bottoms
Increased relative volatility

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Mass Transfer
A binary mixture of benzene and cyclohexane is separated by

Flash vaporisation
Solvent extraction
Ordinary distillation
Extractive distillation

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MORE MCQ ON Mass Transfer

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