(A) During the extraction of copper from copper pyrites $(CuFeS_2)$,the ore is roasted to convert iron sulphide $(FeS)$ into iron oxide $(FeO)$.$2FeS

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(A) During the extraction of copper from copper pyrites $(CuFeS_2)$,the ore is roasted to convert iron sulphide $(FeS)$ into iron oxide $(FeO)$.$2FeS + 3O_2 \rightarrow 2FeO + 2SO_2$To remove the impurity of $FeO$,silica $(SiO_2)$ is added as a flux.$FeO + SiO_2 \rightarrow FeSiO_3$ (slag).Thus,$SiO_2$ is added to form the slag.