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Which of the following processes does not involve oxidation of iron?
A
Rusting of iron sheets
B
Decolourisation of blue $CuSO_4$ solution by iron
C
Formation of $Fe(CO)_5$ from Fe
D
Liberation of $H_2$ from steam by iron at high temperature
Detailed Solution
In $Fe(CO)_5$, CO is a neutral ligand, so iron stays in the 0 oxidation state — the same as in metallic Fe.
In rusting, reaction with $CuSO_4$ and reaction with steam, iron is oxidised.
In rusting, reaction with $CuSO_4$ and reaction with steam, iron is oxidised.