The denticity of an organic ligand, biuret is:

Question

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Strategy:
 Examine the molecular structure of biuret to identify the available electron-pair donor atoms.

Step 1: Structure of biuret
Biuret is formed from two molecules of urea and has the structure .

Step 2: Identify donor sites
Biuret contains three nitrogen atoms that can donate lone pairs to a central metal ion.
- Two terminal  nitrogen atoms.
- One central  nitrogen atom.
Because it can coordinate through these 3 nitrogen atoms, it is a tridentate ligand.

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