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Fe2O3 + 3CO >>> 2Fe + 3CO2
4CuS + 6O2 >>> 4Cu2O + 4SO2
b) Fe2O3 + 3(CO) => 2Fe + 3(CO2)
c) 4(CuS) + 6(O2) => 2(Cu2O) + 4(SO2)
D) CaCl2 + H2SO4 => CaSO4 + 2(HCl)