In which of the following compounds tran...

In which of the following compounds transition metal is in oxidation state zero?

A

`[Co(NH_(3))_(6)]Cl_(3)`

B

`[Fe(H_2O)_(6)]SO_(4)`

C

`[Ni(CO)_(4)]`

D

`[Fe(H_2O)_(3)](OH)_(5)`

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The correct Answer is:

C

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