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In which phosphorus industry ortho and polyphosphate are used as raw materials?

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In which phosphorus industry ortho and polyphosphate are used as raw materials?

(a) Nitro-phosphates production

(b) Sodium tripoly-phosphate production

(c) Ammonium phosphates production

(d) Calcium phosphate production

I got this question during an interview for a job.

My question is based upon Inorganic Chemical topic in chapter Inorganic Chemical Industries of Chemical Technology

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Correct answer is (b) Sodium tripoly-phosphate production

The explanation: Ortho and polyphosphate are used as raw materials in the production of sodium tripoly-phosphate. Monoammonium phosphates are used in ammonium phosphate production while phosphate rocks are used in calcium phosphate production.

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