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

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

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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 At some point of time, the operation is shifted to total reflux condition (i.e., no product and residue are being withdrawn and feed to the column is stopped).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,

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

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Mass Transfer
Henry's law states that the

Partial pressure of a component over a solution is proportional to the mole fraction in the vapour
Partial pressure of a component over a solution is proportional to its mole fraction in the liquid
Partial pressure is equal to the product of the mole fraction and total pressure
Vapour pressure is equal to the product of the mole fraction and total pressure

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Mass Transfer
Plate efficiency

Increases due to weeping and dumping of liquid
Increases due to liquid entrainment
Increases due to foaming
Is a function of the mass transfer between liquid and vapour

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