A mixture of phosphate rock ______________ is heated in an electric furnace to produce phosphorous?
Correct answer: B. Sand & coke
- A. Salt & coke
- B. Sand & coke
- C. And coke
- D. And sand
Explanation
Phosphate rock is heated with silica sand and coke in an electric furnace. Sand combines with calcium to form slag, while coke reduces phosphate to elemental phosphorus, so salt is not required.
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