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Super phosphate grade of calcium phosphate is formed by reacting with which of the following acid?

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Super phosphate grade of calcium phosphate is formed by reacting with which of the following acid?

(a) H2SO4

(b) HCl

(c) H3PO4

(d) HNO3

I have been asked this question in final exam.

My question comes from Inorganic Chemical topic in chapter Inorganic Chemical Industries of Chemical Technology

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Correct answer is (a) H2SO4

For explanation I would say: Superphosphate grade of calcium phosphate is produced by the reaction of phosphate rock with sulfuric acid, H2SO4.

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