Mass Transfer
Minimum reflux ratio in a distillation column results in

Minimum reboiler size
Minimum number of trays
Optimum number of trays
Maximum condenser size

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

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Mass Transfer
For absorbing a sparingly soluble gas in a liquid

Liquid side mass transfer co-efficient should be increased
Gas side mass transfer co-efficient should be increased
Mass transfer co-efficient must be kept constant
Liquid side mass transfer co-efficient should be decreased

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