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Mass Transfer

Mass Transfer
Leaching of coarse solid lumps is also termed as

Percolation
Dissolution
Agitation and settling
Decoction

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Mass Transfer
Chemisorption compared to physical absorption has

Lower capacity of the solvent for the solute gas
Lower adsorption rate
Increased utilisation of stagnant zones of the liquid phase
None of these

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

D ∝ T2
D ∝ T
D ∝ T1.5
D ∝ T0.5

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Mass Transfer
Dimension of mass diffusivity is the same as that of

Pressure
Surface tension
Kinematic viscosity
Dynamic viscosity

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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

Remains unaffected
Increases
Decreases linearly
Decreases

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Mass Transfer
For gas absorption, low viscosity solvents are preferred, because of their

Better flow characteristics
Low pumping pressure drop
Rapid absorption rates
All of these

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