In which of the following compounds transition metal has zero oxidatio

1.	In which of the following compounds transition metal has zero oxidation state [CBSE PMT 1999]
A.	\[Cr{{O}_{5}}\]
B.	\[N{{H}_{2}}.N{{H}_{2}}\]
C.	\[NOCl{{O}_{4}}\]
D.	\[\left[ Fe{{\left( CO \right)}_{5}} \right]\]
Answer» B. \[N{{H}_{2}}.N{{H}_{2}}\]

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