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Solution


Q.

Which of the following processes does not involve oxidation of iron             [2015]
1 Formation of Fe(CO)₅ from Fe.  
2 Liberation of H2 from steam by iron at high temperature.  
3 Rusting of iron sheets.  
4 Decolourisation of blue CuSO4 solution by iron.  

Ans.

(1)

Oxidation number of Fe in Fe(CO)5 is zero.