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What is the chemical formula of super phosphate?

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What is the chemical formula of super phosphate?

(a) CaH4 (PO4)2

(b) Ca3 (PO4)2

(c) CaH4 (PO4)2∙CaSO4

(d) (Ca3 (PO4)2)3∙CaF2

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The question is from Inorganic Chemical in division Inorganic Chemical Industries of Chemical Technology

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The correct choice is (c) CaH4 (PO4)2∙CaSO4

Explanation: Chemical formula of super phosphate formed by reaction of phosphate rock with sulfuric acid containing 16-20%  P2O5  is CaH4 (PO4)2∙CaSO4.

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