Which of the following ligands forms a chelate complex?
Show Hint
- Ammonia
- Water
- NO\(_2\)
- Oxalate ion
The Correct Option is D
Solution and Explanation
chelate complex is formed when a ligand attaches to a metal ion through
two or more donor atoms, creating a ring structure. Such ligands are called
polydentate ligands.
Step 1: Understand ligand types.
- Monodentate ligand → one donor atom
- Bidentate ligand → two donor atoms (forms chelate)
Step 2: Analyze the given ligands.
(A) Ammonia (NH\(_3\)): Monodentate ligand → binds through nitrogen only.
(B) Water (H\(_2\)O): Monodentate ligand → binds through oxygen.
(C) NO\(_2\): Usually acts as ambidentate but not chelating in typical coordination.
(D) Oxalate ion (C\(_2\)O\(_4^{2-}\)): Bidentate ligand with two oxygen donor atoms. Forms a ring with the metal → chelation.
Step 3: Conclusion. \[ \therefore \text{Chelating ligand = Oxalate ion} \]
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