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Roasted copper pyrite on smelting with s...

Roasted copper pyrite on smelting with sand produces

A

`FeSiO_(3)` as fusible slag and `Cu_2S` as matter

B

`CaSiO_(3)` infusible slag and `Cu_2O` as matter

C

`Ca_(3)(PO_(4))_(2)` as fusible slag and `Cu_2S` as mattee

D

`Fe_(3)(PO_(4))_(2)`, as infusible slag and `Cu_2S` as matter

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