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Q.

Roasting of copper pyrites is done :

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a

to remove moisture

b

to oxidise free sulphur and antimony

c

to convert pyrite completely into Cu2O and FeO

d

to remove volatile organic impurities

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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Roasting of copper pyrites is done :