WAEC Chemistry 2014 Objective — Question 35
Question 35 of 50 from the West African Examinations Council (WAEC) Chemistry 2014 Objective paper, with the correct answer and a full explanation.
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The reaction that occurs at the anode when CuSO₄(aq) is electrolyzed using carbon electrode is
- A. 2H⁺(aq)+2e⁻→H₂(g)
- B. Cu²⁺(aq)+2e⁻→Cu(s)
- C. 4OH⁻+4e⁻→2H₂O(l)+O₂(g)Correct
- D. SO₄²⁻(aq)−2e⁻→SO₂(g)+O₂(g)
Explanation
At the anode (oxidation), hydroxide ions are discharged in preference to sulphate ions: 4OH⁻ → 2H2O + O2 + 4e⁻.
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