1.

The oxidation number of metal atom is (are)zero in :

Answer»

`[Ni(CO)_(4)]`
`[Fe_(2)(CO)_(5)]`
`Na[Co(CO)_(4)]`
`[CuCl_(4)]^(2-)`

Solution :In neutral carboxy complexes, the oxidation number of M is ZERO. In `[Co(CO)_(4)]^(-1)` the METAL atom is -1 oxidation STATE


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