Mass Transfer
Removal of __________ exemplifies an adsorption unit operation.

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

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Mass Transfer
Molecular diffusion is caused by the

Activation energy of the molecules
Thermal energy of the molecules
Transfer of molecules from low concentration to high concentration region
Potential energy of the molecules

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Mass Transfer
A distillation column with N plates is being operated under normal conditions. At some point of time, the operation is shifted to total reflux condition (i.e., no product and residue are being withdrawn and feed to the column is stopped). At the new steady state,

The top and bottom compositions are unchanged with and without total reflux
The top and bottom compositions correspond to the maximum enrichment available
Composition of vapors and that of liquid do not vary throughout the column
Reboiler load and condenser load are minimum

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