Extraction of copper is done using copper pyrites. After roasting, the ore is mixed with silica and coke and then smelted in a blast furnace. The matte obtained from the blast furnace is charged into a silica-lined converter. Some silica is also added, and a hot air blast is blown into the mixture to obtain blister copper, which is purified by electrorefining.
The chemical formula of copper pyrites is.
A. `CuFeS_(2)`
B. `Cu_(2)S`
C. `Cu_(2)O`
D. `CuCO_(3).Cu(OH)_(2)`
