Mass Transfer
As per Gilliland's equation, the diffusivity is

All of these
Inversely proportional to 'P'
Dependent on the molecular volume & molecular weight of components
Directly proportional to 'T1.5'

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Mass Transfer
For water-ethanol system, the minimum reflux ratio

Is the optimum reflux ratio
Is computed from the slope of the upper operating line that is tangent to the equilibrium curve
Cannot be computed
Is computed from the intercept of the operating line

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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.

Reboiler load is the same in both the cases but condenser load is higher in case (ii)
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)

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