1) The chemical composition of slag formed during the smelting process in the extraction of copper is A) $Cu_{2}O+FeS$ B) $FeSiO_{3}$ C) $CuFeS_{2}$ D) $Cu_{2}S+ FeO$ Answer: Option DExplanation:During smelting process of copper from copper pyrites reaction are $Cu_{2}O+FeS\rightarrow Cu_{2}S+FeO$ $2FeS+3O_{2}\rightarrow2FeO+2SO_{2}$
