Question

The stability constans of the complexes formed by a metal ion $M^{2+}$ with $N{H}_3,C{N}^{-}{H}_{2}O$ are of the order of ${10}^{15},{10}^{27},{10}^{11}$ respectively. Then :

• A. $N{H}_3$ is the strongest ligand
• B. $C{N}^{-}$ is the strongest ligand
• C. These values cannot predict the strength of the ligand
• D. All the ligands are equally strong

Answer 1

The correct option is B $C{N}^{-}$ is the strongest ligand

The stability constants of the complexes formed by a metal ion $M^{2+}$ with $N{H}_3,C{N}^{-}{H}_{2}O$ are of the order of ${10}^{15},{10}^{27},{10}^{11}$ respectively. Then $C{N}^{-}$ is the strongest ligand as the value of the stability constant for the complex between metal ion $M^{2+}$ and $C{N}^{-}$ ligand is maximum.