Question

The stability constants of the complexes formed by a metal ion $(M^{2+})$ with $NH_3,\, CN^-,\, H_2O$ and en are of the order $10^{11},\, 10^{27}, \,10^{15},$ and $10^8$ respectively. This shows

• A. en is the strongest ligand
• B. $CN^-$ is the strongest ligand
• C. values cannot predict the strength of the ligand
• D. all the ligands are equally strong.

Answer 1

Answer: (B)

Higher the value of stability constant, stronger will be the ligand. Thus $CN^-$ is the strongest ligand as it has $10^{27}$ value of stability constant.