Transition metals as catalysts Quiz
Studying this course? Keep your progress in one place.
Pick an answer for each. Quizzes never use energy.
5 questions, one answer each
Each answer is checked as you go, with why.
See all 5 questions
1. Which of these is a heterogeneous catalyst?
- A. Fe²⁺(aq) in the reaction of I⁻ with S₂O₈²⁻
- B. Mn²⁺(aq) in the reaction of MnO₄⁻ with C₂O₄²⁻
- C. Solid iron in the Haber process
- D. Aqueous H⁺ in ester hydrolysis
2. Why does the reaction of MnO₄⁻ with C₂O₄²⁻ speed up as it proceeds?
- A. Temperature rises throughout
- B. Mn²⁺ is produced and catalyses the reaction
- C. MnO₄⁻ concentration increases
- D. The ethanedioate ions become positive
3. What is the effect of poisoning on a heterogeneous catalyst?
- A. It blocks active sites, reducing efficiency
- B. It increases the surface area
- C. It changes the equilibrium constant
- D. It raises the activation energy of the products
4. Which pair shows the change in oxidation state of vanadium in the first step of the Contact process mechanism?
- A. +3 to +5
- B. +5 to +4
- C. +4 to +2
- D. +5 to +7
5. Why is the Fe²⁺ route for S₂O₈²⁻ + 2I⁻ faster than the uncatalysed route?
- A. Fe²⁺ increases the temperature
- B. Each step involves oppositely charged ions, so the activation energy is lower
- C. Fe²⁺ is consumed permanently
- D. Fe²⁺ changes the equilibrium position