Mass Transfer
Gaseous diffusion co-efficient increases with increase in the

Temperature
Pressure
None of the listed here
Both Pressure & Temperature

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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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Mass Transfer
One mole feed of a binary mixture of a given composition is flash vaporised at a fixed P and T. If Raoult's law is obeyed, then changing the feed composition would effect

The product composition as well as the fraction vaporised
Neither the product composition nor the fraction vaporised
The product composition but not the fraction vaporised
The fraction vaporised but not the product composition

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