Question

The most stable complex among the following is

• A. $K_3[A1(C_2O_4)_3]$
• B. $[Pt(en)_2]Cl_2$
• C. $[Ag(NH_3)_2]CI$
• D. $K_2[Ni(EDTA)]$

Answer 1

Answer: (D)

$K_2[Ni(EDTA)]$

Answer 2

In the complex $K_2[Ni(EDTA)]$, EDTA is a hexadentate ligand. Such a complex will be more stable than complexes formed with bidentate ligands like $C_2O^{2-}_4 \, , (en)_2$ or monodentate ligand, $NH_3$.