Mass Transfer
Pick out the system with minimum boiling azeotrope at 1 atm.

Benzene-toluene
Hydrochloric acid-water
All of these
Ethyl alcohol-water

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

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

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