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How triple-superphosphate is made?

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How triple-superphosphate is made?

(a) Phosphate rock+H2SO4

(b) Phosphate rock+HCl

(c) Phosphate rock+HNO3

(d) Phosphate rock+H3PO4

The question was posed to me in unit test.

This is a very interesting question from Inorganic Chemical in portion Inorganic Chemical Industries of Chemical Technology

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Correct option is (d) Phosphate rock+H3PO4

Explanation: Triple-superphosphate can be made by reacting phosphate rock with phosphoric acid. It contains 42-50% P2O5 while ‘phosphate rock+H2SO4’ gives superphosphate.

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