$\left[ Ag \left( H _{2} O \right)_{2}\right]\left[ Ag ( CN )_{2}\right]$
Coordination number $=2$,
Oxidation state $= Ag ^{+1}$
Diaquasilver$(I)$ dicyanidoargentate$(I)$
$(I)\ [Pt(NH_3)_6]Cl_4$
$(II) [Cr(NH_3)_6]Cl_3$
$(III) [Co(NH_3)Cl_2]Cl$
$(IV) K_2[PtCl_6]$