1.

Silica is added to the sulphide ore of copper in reverberatory furnace becauseA. sulphide ore of copper contains iron as impurity which is removed as iron slag.B. silica reacts with `Cu_(2)O` to form slagC. silica helps in reduction of `Cu_(2)O ` to CuD. sulphide ore of copper is separated from iron by reacting with silica.

Answer» Correct Answer - A
The impurities of iron present with copper are removed as iron silicate.
`FeO + SiO_(2) to underset("Slag")(FeSiO_(3))`


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