Formation of metallic copper from the sulphide ore in the commercial metallurgical process involves.
a. Cu2S+23O2⟶Cu2O+SO2 ; Cu2O+C⟶2Cu+CO
b. Cu2S+23O2⟶Cu2O+SO2 ; 2Cu2O+Cu2S⟶6Cu+SO2
c. Cu2S+2O2⟶CuSO4 ; CuSO4+Cu2S⟶3Cu+2SO2
d. Cu2S+23O2⟶Cu2O+SO2 ; Cu2O+CO⟶2Cu+CO2