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

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Mass Transfer
Steam distillation is used to

Avoid thermal decomposition of a component
Increase the total pressure of distillation
Reduce the number of plates
Increase the efficiency of separation

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Mass Transfer
In a counter-current liquid extractor

Liquid's flow rate depends upon the temperature and pressure
Both liquids can have any desired flow rate
Both liquids flow at fixed rate
Only one of the liquids may be pumped at any desired rate

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