Question

Specify the oxidation numbers of the metals in the following coordination entities:
(i) [Co(H₂O)(CN)(en)2]²⁺
(ii) [CoBr₂(en)2]+
(iii) [PtCl4]²⁻ (iv) K3[Fe(CN)6]
(v) [Cr(NH3)3Cl3]

Answer 1

Let the oxidation number of Pt be x.
The charge on the complex is −2.