A) \[FeS{{O}_{4}}.{{(N{{H}_{4}})}_{2}}S{{O}_{4}}.6{{H}_{2}}O\]
B) \[{{K}_{4}}Fe{{(CN)}_{6}}\]
C) \[Fe{{(CO)}_{5}}\]
D) \[F{{e}_{2}}O\]
E) \[{{K}_{2}}Fe{{O}_{4}}\]
Correct Answer: C
Solution :
Iron has zero oxidation state in carbonyl complexes.
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