WAEC Chemistry 2023 Objective — Question 11
Question 11 of 50 from the West African Examinations Council (WAEC) Chemistry 2023 Objective paper, with the correct answer and a full explanation.
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The reduction half equation of the following reaction is: Zn(s) + CuSO4(aq) → ZnSO4(aq) + Cu(s)
- A. CuSO4(s) + H2O(l) → Cu2+(aq) + SO4²⁻(aq)
- B. Cu2+(aq) + 2e⁻ → Cu(s)Correct
- C. Cu2+(aq) + e⁻ → Cu(s)
- D. Zn(s) → Zn2+(aq) + 2e⁻
Explanation
Zn + CuSO4 → ZnSO4 + Cu. Ionically: Zn + Cu2+ → Zn2+ + Cu. Reduction half equation: Cu2+ + 2e⁻ → Cu. (Oxidation half equation: Zn → Zn2+ + 2e⁻.)
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