Reaction of phosphate rock with 98% H2SO4 produces ______________________?
Correct answer: D. Ortho-phosphoric acid
- A. None of these
- B. Superphosphate
- C. White phosphorous
- D. Ortho-phosphoric acid
Explanation
Concentrated sulphuric acid attacks phosphate rock in the wet process, producing ortho-phosphoric acid along with calcium sulphate. Ortho-phosphoric acid is the common H3PO4 form used in fertilizer manufacture.
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