Storage cells and fuel cells Quiz
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5 questions, one answer each
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1. Which half-equation occurs at the positive electrode of a hydrogen–oxygen fuel cell with an acidic electrolyte?
- A. H₂ → 2H⁺ + 2e⁻
- B. O₂ + 4H⁺ + 4e⁻ → 2H₂O
- C. O₂ + 2H₂O + 4e⁻ → 4OH⁻
- D. 2H⁺ + 2e⁻ → H₂
2. Why can a lead–acid battery be recharged?
- A. It contains a catalyst
- B. Its electrolyte is replaced during charging
- C. The products stay on the electrodes, so an applied reverse voltage regenerates the reactants
- D. Its E° values are very large
3. Which statement correctly distinguishes a fuel cell from a storage cell?
- A. A fuel cell is supplied with reactants continuously
- B. A fuel cell has an emf that falls steadily
- C. A fuel cell is recharged by reversing the reaction
- D. A fuel cell has no electrodes
4. What is the overall reaction in an alkaline hydrogen–oxygen fuel cell?
- A. H₂ + O₂ → H₂O₂
- B. 2H₂ + 4OH⁻ → 4H₂O
- C. O₂ + 2H₂O → 4OH⁻
- D. 2H₂ + O₂ → 2H₂O
5. In a methanol fuel cell with an acidic electrolyte, what is the half-equation at the negative electrode?
- A. CH₃OH → CO₂ + 4H⁺ + 4e⁻
- B. CH₃OH + H₂O → CO₂ + 6H⁺ + 6e⁻
- C. O₂ + 4H⁺ + 4e⁻ → 2H₂O
- D. CH₃OH + 6H⁺ + 6e⁻ → CO₂ + H₂O