Question

Which of the following factors tends to increase the stability of metal ion complexes?

• A. Higher ionic radius of the metal ion
• B. Higher charge/size ratio of the metal ion
• C. Lower ionisation potential of the metal ion
• D. Lower basicity of the ligand

Answer 1

The correct option is B Higher charge/size ratio of the metal ion

For a given ligand, the stability of complexes of metallic ions having the same charge on them decreases with the increase of the size of the central metal ions. Again if the charge of central metal ion is more and the site is small, then the stability of the complex is more. Higher charge/size ratio of metal ion i.e highly charged cation and the smaller cation can form more stable complexes.

Answer will be B.