Mass Transfer
In liquid extraction, if the selectivity is unity, then

Amount of solvent required will be minimum
No separation will occur
Solvent flow rate should be very low
Separation of the constituents is the most effective

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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 product composition but not the fraction vaporised
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

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