In which of the following coordination compounds, the central metal iron is in zero oxidation state?

In which of the following coordination compounds, the central metal ion is in Zero oxidation sate ?

In which of the following coordinate compounds the central metal atom obeys the EAN rule.

Which of following coordination compounds contains the central metal witrh the highest oxidation number ?

in which of the following transition metal complexes does the metal exhibits zero oxidation state.

In which of the following transition metal complexes does the metal exhibit zero oxidation state?

In which of the following complexes the metal ion is in zero oxidation state?

In which of the following complexes the metal ion is in zero oxidation state ?