The charge on a complex is the sum of the oxidation state of the metal center and the charges on the ligands. CO is a neutral ligand. Hence, the charge on the ligand is 0. Hence, the total charge on the complex is also 0.To calculate the oxidation number of Fe in the complex, (charge on Fe)+5(charge on CO)=0 (charge on Fe)+5(0)=0 (charge on Fe)=0 Hence, the oxidation number of Fe is 0. The correct option is (b).
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