The addition of silica during the extraction

Question:

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

Correct Option: , 2

Solution:

Silica is used to remove FeO impurity from the ore of copper

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