Ligand substitution and the chelate effect Quiz
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5 questions, one answer each
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1. What is the co-ordination number of [Fe(C₂O₄)₃]³⁻, which contains three ethanedioate ligands, each bidentate?
- A. 3
- B. 4
- C. 6
- D. 9
2. Why does [Cu(H₂O)₆]²⁺ change co-ordination number with Cl⁻ but not with NH₃?
- A. Cl⁻ is larger than NH₃ and H₂O
- B. Cl⁻ is uncharged
- C. NH₃ is a bidentate ligand
- D. Cl⁻ forms ionic bonds
3. Which statement about carbon monoxide poisoning is correct?
- A. CO oxidises the iron in haem to Fe³⁺
- B. CO forms a weaker bond than O₂ to Fe(II) so is displaced
- C. CO replaces oxygen at Fe(II) in haemoglobin
- D. CO breaks down the haem ligand
4. In [Ni(NH₃)₆]²⁺ + 3en → [Ni(en)₃]²⁺ + 6NH₃, which is true?
- A. Entropy decreases as particles are joined
- B. Entropy increases as the number of particles rises from 4 to 7
- C. ΔH is large and positive
- D. The co-ordination number changes from 6 to 3
5. A student calculates ΔG for a reaction with ΔH = −20 kJ mol⁻¹ and ΔS = +150 J K⁻¹ mol⁻¹ at 300 K. What is ΔG?
- A. −65 kJ mol⁻¹
- B. −44 kJ mol⁻¹
- C. +25 kJ mol⁻¹
- D. −20.15 kJ mol⁻¹