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Which solvent is used as make-up for the extraction of H3PO4 from CaCl2 solution?

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Which solvent is used as make-up for the extraction of  H3PO4 from CaCl2  solution?

(a) Acetone

(b) Benzene

(c) Water

(d) Amyl alcohol

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I'm obligated to ask this question of Inorganic Chemical topic in chapter Inorganic Chemical Industries of Chemical Technology

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Correct answer is (d) Amyl alcohol

The explanation is: Butanol or amyl alcohol is generally used as make-up solvent for the extraction of  H3PO4   from CaCl2  solution.

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