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

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Mass Transfer
When the solvent dissolves very little of solute, then

Solvent of low latent heat of vaporisation should be used
Solvent of low freezing point should be used
Very small quantity of solvent is required
Large quantity of solvent is required to extract the solute

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Mass Transfer
Plate towers are preferred to packed towers, when large temperature changes are involved, because of the reason that the

Pressure drop in the equipment will be very high
None of these
Packing may be crushed due to thermal expansion/contraction of the components of the equipments
Viscosity variation of the fluids may cause channeling/flooding

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