Transition metals as catalysts Quiz
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5 questions, one answer each
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1. Which is a homogeneous catalyst?
- A. Platinum in a catalytic converter
- B. V₂O₅ in the Contact process
- C. Fe²⁺(aq) in the reaction of I⁻(aq) with S₂O₈²⁻(aq)
- D. A solid catalyst in a gas reaction
2. What is the oxidation number of vanadium in V₂O₄?
- A. +3
- B. +4
- C. +5
- D. +2
3. Which step comes immediately after adsorption on a catalytic converter surface?
- A. Weakening of bonds in the adsorbed molecules
- B. Desorption of CO₂
- C. Formation of a solution
- D. Dissolving of the catalyst
4. Why does the reaction of MnO₄⁻ with C₂O₄²⁻ speed up as it proceeds?
- A. The temperature rises
- B. The Mn²⁺ product acts as a catalyst
- C. The concentration of MnO₄⁻ increases
- D. The solution turns purple
5. What is the E°cell for 2Fe²⁺ + S₂O₈²⁻ → 2Fe³⁺ + 2SO₄²⁻? (E° for S₂O₈²⁻/SO₄²⁻ = +2.01 V, Fe³⁺/Fe²⁺ = +0.77 V)
- A. +2.78 V
- B. −1.24 V
- C. +0.77 V
- D. +1.24 V