In which of the following transition metal complexes does the metal exhibit zero oxidation state ?
(a) [Co(NH₃)₆]Cl₃
(b) [Fe(H₂O)₆]SO₄
(c) Ni(CO)₄
(d) [Fe(H₂O)₆]X₃
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answer should be c as CO as it is a neutral ligand
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