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Mass Transfer

Mass Transfer
Penetration theory relates the average mass transfer co-efficient (K) with diffusivity (D) as

K ∝ D1.5
K ∝ D2
K ∝ √D
K ∝ D

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Mass Transfer
In case of physical adsorption, the difference between heat of adsorption and heat of normal condensation is

Called integral heat of adsorption
Equal to the heat of wetting
Zero
Equal to the heat of formation of surface compound

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Mass Transfer
For contacting a highly soluble gas with a liquid

Both of the options given here
Bubble the gas through liquid
Spray the liquid on gas stream
None of the listed here

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Mass Transfer
Desulphurisation of petrol is done in a

Bollman extractor
Packed extraction column
Plate type extraction column
Rotating disc extractor

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Mass Transfer
In continuous distillation, the internal reflux ratio (Ri) and the external reflux ratio (Re) are related as

Ri = (1 - Re)/Re
Ri = Re
Ri = Re/(1 + Re)
Ri = Re/(1 - Re)

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Mass Transfer
The operation involved when the soluble material is largely on the surface of an insoluble solid and is merely washed off by the solvent is called

Elutriation or elution
Decoction
None of these
Percolation

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