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The addition of silica during the extraction of copper from its sulphide ore :- (1) converts copper sulphide into copper silicate (2) converts iron oxide into iron silicate (3) reduces copper sulphide into metallic copper (4) reduces the melting point of the reaction mixture

1. (1) converts copper sulphide into copper silicate
2. (2) converts iron oxide into iron silicate
3. (3) reduces copper sulphide into metallic copper
4. (4) reduces the melting point of the reaction mixture

Correct answer: (2) converts iron oxide into iron silicate

Solution

The addition of silica during the extraction process helps to form iron silicate from iron oxide, which aids in the separation of impurities from the desired metal, thus improving the efficiency of the extraction.

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