Pick out the correct statement ?

Mass Transfer 02/12/2021

A. In case of liquid-liquid extraction, no separation is possible, if the selectivity of the solvent
used is unity
B. With increase in temperature, the selectivity of the solvent used in solvent extraction
decreases
C. The selectivity of solvent used in solvent extraction is unity at the plait point
D. All A., B. and C.

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