Question

Specify the oxidation numbers of the metals in the following coordination entities:
(i)$[Co(H_2O)(CN)(en)_2] ^{2+}$
(ii) $[CoBr_2(en)_2]^{+}$
(iii)$[PtCl_4]^{ 2–}$
(iv) $K_3[Fe(CN)_6]$
(v) $[Cr(NH_3)_3Cl_3]$

Answer 1

(i)$[Co(H_2O)(CN)(en)_2]^{2+}$
Let the oxidation number of $Co$ be x.
The charge on the complex is$+2.$

(ii)$[Pt(Cl)_4]^{2-}$
Let the oxidation number of Pt be $x.$
The charge on the complex is$- 2.$