Transition metals as catalysts Quiz
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5 questions, one answer each
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1. Why is vanadium(V) oxide in the Contact process a heterogeneous catalyst?
- A. It is used up in the reaction
- B. It is a solid and the reactants are gases
- C. It is a transition metal compound
- D. It lowers the temperature needed
2. What happens to the oxidation number of vanadium when SO₂ reacts with V₂O₅?
- A. +4 to +5
- B. +5 to +3
- C. +3 to +5
- D. +5 to +4
3. Which statement about a catalytic converter is correct?
- A. Adsorption weakens the bonds in CO and NO
- B. The metal dissolves in the exhaust gases
- C. CO₂ and N₂ remain bonded to the surface
- D. The catalyst is consumed by the reaction
4. Why does Fe²⁺ speed up the reaction of I⁻ with S₂O₈²⁻?
- A. It oxidises iodide directly
- B. It makes the solution more acidic
- C. It provides a route with steps between oppositely charged ions
- D. It increases the temperature
5. In the titration of ethanedioate with manganate(VII), why do the first drops decolourise slowly?
- A. Mn²⁺ is not yet present to catalyse the reaction
- B. The solution is too cold for any reaction
- C. Sulfuric acid inhibits the reaction
- D. Manganate(VII) is a solid