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PUCET (Punjab) Polydentate Ligands — practice questions

Explore 2 free Polydentate Ligands questions in PUCET (Punjab) Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Polydentate Ligands questions and exercises with answers

Showing questions 1–2 of 2.

**EDTA** (ethylenediaminetetraacetate) is a:Read the answer and worked solution →Ethylenediamine (en, H₂N-CH₂-CH₂-NH₂) is a:Read the answer and worked solution →

Worked practice questions

**EDTA** (ethylenediaminetetraacetate) is a:

  1. Monodentate ligand
  2. Bidentate ligand
  3. Tetradentate ligand
  4. Hexadentate ligand
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Correct answer: D. Hexadentate ligand

EDTA binds via 4 oxygen donors (from 4 carboxylate groups) + 2 nitrogen donors = **6** donor atoms — hence hexadentate. It chelates metal ions in an octahedral cage used in water-softening and titrations.

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Ethylenediamine (en, H₂N-CH₂-CH₂-NH₂) is a:

  1. Monodentate
  2. Bidentate
  3. Tridentate
  4. Hexadentate
Show answer and solution

Correct answer: B. Bidentate

Two nitrogen donors per molecule — each lone pair on N coordinates with the metal. Forms a 5-membered chelate ring; commonly used in [Co(en)₃]³⁺ etc.

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