`[Co(EDTA)]^(-)` has two optical ISOMERS. `[Co(NH_(3))_(5)(NO_(2))]^(2+)` show LINKAGE isomerism. For `[Pt(NH_(3))BrClI(NO_(2))py]`, theoretically fifteen different geometrical isomers are possible. `[Cr(H_(2)O)_(4)Cl_(2).2H_(2)O` is an EXAMPLE of hydrate as well as linkage isomerism.