(B) During the extraction of copper from copper pyrites $(CuFeS_2)$,the ore is roasted to remove sulfur and then smelted in a blast furnace. In the fu

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(B) During the extraction of copper from copper pyrites $(CuFeS_2)$,the ore is roasted to remove sulfur and then smelted in a blast furnace. In the furnace,iron oxide $(FeO)$ is formed as an impurity. Silica $(SiO_2)$ is added as a flux to remove this impurity. $FeO + SiO_2 \rightarrow FeSiO_3$ (slag). Thus,the slag formed is iron silicate $(FeSiO_3)$.