Mass Transfer
Removal of __________ exemplifies an adsorption unit operation.

Uranium from its ore
None of the listed here
Ammonia from coke oven gas
Water from petrol

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Mass Transfer
Priming in a distillation column

Is desirable from point efficiency consideration
Results from very low gas velocity
Reduces the overall pressure drop
Is characterised by the presence of foam throughout the space between trays

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Mass Transfer
Compound A is extracted from a solution of A + B into a pure solvent S. A Co-current unit is used for the liquid-liquid extraction. The inlet rate of the solution containing A is 200 moles of B/hr.m² and the solvent flow, rate is 400 moles of S/m². hr. The equilibrium data is represented by Y = 3X² , where Y is in moles of a A/moles of B and X is in moles A/moles of S. The maximum percentage extraction achieved in the unit is

0.5
0.9
0.25
0.7

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