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Why is sulphide ore of copper heated in ...

Why is sulphide ore of copper heated in a furnace afer mixing with silica?

A

remove `FeO` as `FeSiO_3`

B

separate `CuO` as `CuSiO_(3)`

C

decrease the temperature needed for roasting of `Cu_(2)S`

D

remove calcium as `CaSiO_(3)`

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