Mass Transfer
In case of absorption, both the operating and equilibrium lines will be straight for

Isothermal operation
Dilute solutions
Dilute solutions and isothermal operation
None of these

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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 freezing point should be used
Solvent of low latent heat of vaporisation should be used
Very small quantity of solvent is required

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