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When copper pyrites is roasted in excess...

When copper pyrites is roasted in excess of air, a mixture of `CuO + FeO` is formed. `FeO` is present as impurity. This can be removed as slag during reduction of `CuO`. The flux added to form slag is

A

`SiO_(2)`, which is an acidic flux

B

Limestone, which is a basic flux

C

`SiO_(2)` ,which is a basic flux

D

CaO, which is a basic flux

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