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In which phosphorous industry ‘acidulation’ reaction is occur?

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In which phosphorous industry ‘acidulation’ reaction is occur?

(a) Elemental phosphorus production

(b) Phosphorus pentoxide production

(c) Phosphoric acid production

(d) Calcium phosphate production

The question was asked during a job interview.

My doubt is from Inorganic Chemical in section Inorganic Chemical Industries of Chemical Technology

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Right answer is (d) Calcium phosphate production

Explanation: ‘Acidulation’ reaction is associated with calcium phosphate production. In this reaction phosphate rock reacts with aqueous H2SO4 and produced superphosphate and HF.

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