Latest IIT-JEE Aptitude Question SOLUTION: Among the following complexes (K-P) K3[Fe(CN)6] (K), [Co(NH3)6]Cl3 (L), Na3[Co(oxalate)3] (M), [Ni(H2O)6]Cl2 (N), K2[Pt(CN)4] (O) and [Zn(H2O)6](NO3)2 (P) (A) K, L, M, N (B) K, M,