Calculate the oxidation state of metal ion in:
i) `[Ag(CN)_(2)]^(-)`
ii) `[Ni(CO)_(4)]`
iii) `[Fe(CN)_(6)]^(3-)`

Calculate the oxidation state of central metal atom in i) [Co(NH_(3))_(5)Cl]^(2+) ii) K_(4)[Fe(CN)_(6)] iii) [Co(NO_(2))_(2)(py)_(2)(NH_(3))_(2)]NO_(3)

Calculate the oxidation number of Ni in K_(2)[Ni(CN)_(4)] .

Calculate the oxidation number of Ni in K_(2)[Ni(CN)_(4)] .

Calculate the oxidation state of the central metal of the complex [Ni(CN)_4]^(2-)

The oxidation state of Ni in [Ni(CN)_4]^(2-) ion is:

The oxidation state of Fe in [Fe(CN)_6]^(-3) ion is