Roasting of copper pyrites is done :

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to convert pyrite completely into ${Cu}_{2} O$ and FeO

to remove volatile organic impurities

to oxidise free sulphur and antimony

to remove moisture

answer is A, B, D.

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Detailed Solution

Roasting copper pyrites is done for several reasons, including removing moisture, oxidising free Sulphur and antimony, and transforming the pyrite into copper oxide and ferrous oxide to eliminate volatile organic impurities.

Sulfur, arsenic, and antimony are eliminated together with moisture in the form of their volatile oxides. To produce Sulphur dioxide, free Sulphur is oxidized. Copper pyrite breaks down into ferrous and cuprous sulfurizes.

As a result, choices A, B, and C are accurate.

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