1.

A complex compound in which the oxidation number of a metal is zero

Answer»

`[Ni(CO)_(4)]`
`[Pt(NH_(3))_(4)]Cl_(2)`
`K_(4)[Fe(CN)_(6)]`
`K_(3)[Fe(CN)_(6)]`

Solution :Co is a neutral ligand , HENCE it has ZERO oxidation state in the cpmplex `[Ni(CO)_(4)]`.


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