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

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Mass Transfer
Inside the distillation column, the

Liquids are not always at their bubble points
None of these
Driving force for the vapour flow is the pressure drop
Pressure increases gradually from bottom to the top of the column

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