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
a₁ = a₂
None of these
a₁ = 0.5 a₂

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Mass Transfer
In a distillation operation, what is the effect of the temperature of the reflux stream (given below) on the condenser and reboiler loads? Reflux conditions:(i) Reflux stream is completely liquid and is at its bubble point.(ii) Reflux stream is below its bubble point.

Condenser load is the same in both the cases but reboiler load is higher in case (ii)
Condenser and reboiler loads are the same in both the cases
Both condensor and reboiler loads are higher in case (ii) as compared to case (i)
Reboiler load is the same in both the cases but condenser load is higher in case (ii)

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Mass Transfer
Steam distillation is used to

Avoid thermal decomposition of a component
Increase the efficiency of separation
Reduce the number of plates
Increase the total pressure of distillation

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