A) \[[Fe{{(CO)}_{5}}]\]
B) \[N{{H}_{2}}.N{{H}_{2}}\]
C) \[NOCl{{O}_{4}}\]
D) \[Cr{{O}_{5}}\]
Correct Answer: A
Solution :
Oxidation state of Fe in \[Fe{{(CO)}_{5}}\] is zero because CO is neutral ligand and it shows zero oxidation state. In metal carbonyls, oxidation state of metal is always zero.
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