Complex Stability
Which factor increases stability of a metal complex?
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About This Question
- Subject
- chemistry
- Chapter
- d- and f-block elements
- Topic
- complex stability
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
High charge density and chelation
- Charge Density: Small cations with high charge (e.g.,Fe3+,Al3+) attract ligands more strongly, creating a more stable coordinate bond.
- The Chelate Effect: When a ligand forms multiple bonds with a single metal ion (bidentate or polydentate), it forms a 'ring' structure called a chelate.
- Thermodynamics: Forming a chelate increases the number of free particles in the solution (entropy ΔS>0), which significantly drives the reaction toward the complex.
- Contrast: Monodentate ligands (like H2O or Cl−) yield less stable complexes compared to chelating ligands like ethylenediamine (en) or EDTA.
This medium difficulty chemistry question is from the chapter d- and f-block elements, covering the topic of complex stability. It appeared in the 2025 exam.
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