Which of the following is a chelating ligand?
Show Hint
- ( NH_3 \)
- ( H_2 O \)
- ( Cl- \)
- ( C_2 O_42- \)
The Correct Option is D
Solution and Explanation
Concept: A chelating ligand is a polydentate ligand that can bond to a single central metal atom through two or more donor atoms simultaneously, forming a ring structure (chelate ring).
Step 1: Identify the denticity of the options.
\( NH_3 \) (Ammonia): Unidentate (one donor N atom). \( H_2 O \) (Water): Unidentate (one donor O atom). \( Cl- \) (Chloride): Unidentate (one donor Cl atom). \( C_2 O_42- \) (Oxalate): Didentate (two donor O atoms).
Step 2: Determine the chelating agent.
Because the oxalate ion (\( C_2 O_42- \)) has two donor atoms that can coordinate to the same metal ion to form a five-membered ring, it is classified as a chelating ligand.
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