Mass Transfer
If a₁ and a₂ are the relative volatilities when the pressure in the distillation column is 1 and 2 atm respectively. Pick out the correct statement.

a₁ = 2a₂
None of these
a₁ = 0.5 a₂
a₁ = a₂

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Mass Transfer
Plate efficiency

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

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