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

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

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Mass Transfer
If the solubilities of different components (in a liquid-liquid extraction system) increase with rise in temperature, then the temperature above which they dissolve completely is known as the critical solution temperature (CST or consolute temperature). If solubilities increase with decrease in temperature, then CST is the temperature below which they dissolve completely. If a binary system has no critical solution temperature, it implies that

The system comprises of miscible liquids
On heating, a vapor phase will appear ; while on cooling, a solid phase will appear
The system comprises of an azeotrope
The system comprises of partially mis-cible liquids

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