Ligand exchange and the chelate effect Quiz
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5 questions, one answer each
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1. What is the colour of [CoCl₄]²⁻?
- A. Pink
- B. Blue
- C. Yellow
- D. Green
2. Why does EDTA⁴⁻ replace all six water ligands in [Cu(H₂O)₆]²⁺ with a large increase in entropy?
- A. It is a strong oxidising agent
- B. It forms weaker bonds than water
- C. It reduces the coordination number to 4
- D. Two particles of reactant form seven particles of product
3. Which change occurs when a few drops of ammonia are added to aqueous Cu²⁺?
- A. A pale blue precipitate forms
- B. A deep blue solution forms
- C. A yellow solution forms
- D. Copper metal is deposited
4. ΔH = −24 kJ mol⁻¹ at 300 K. What is ΔS_surroundings?
- A. −80 J K⁻¹ mol⁻¹
- B. +0.080 J K⁻¹ mol⁻¹
- C. +80 J K⁻¹ mol⁻¹
- D. −0.080 J K⁻¹ mol⁻¹
5. Why is [Ni(NH₃)₆]²⁺ + 3en → [Ni(en)₃]²⁺ + 6NH₃ favourable even though ΔH is small?
- A. The new bonds are much stronger
- B. The coordination number increases
- C. Ethanol is released
- D. ΔS_system is positive, so ΔS_total is more positive