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

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Mass Transfer
Fenske's equation for determining the minimum number of theoretical stages in distillation column holds good, when the

Relative volatility is reasonably constant
Mixture (to be separated) shows positive deviation from ideality
Mixture (to be separated) shows negative deviation from ideality
Multicomponent distillation is involved

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