Which of the following processes does not involve oxidation of iron?
Formation of Fe (CO)5 from Fe.
Liberation of H2H_2H2 from steam by iron at high temperature.
Rusting of iron sheets.
Decolorization of blue CuSO4CuSO_4CuSO4 solution by iron.
(A) Formation of Fe (CO)5 from Fe.
Explanation: