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silica is added to the copper pyrites ore, when taken in reverberatory furnace for extraction of Cu. This is because

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it helpes in separation of Cu from Fe

it removes the impurity of iron as slag

it reduce Cu₂O to Cu

it reacts with Cu₂O to form slag

answer is A.

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Detailed Solution

Silica removes the impurity of FeO, present in the extraction of copper pyrites as slag (FeSiO₃).

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