WAEC Chemistry 2010 Theory — Question 44
Question 44 of 46 from the West African Examinations Council (WAEC) Chemistry 2010 Theory paper, with the correct answer and a full explanation.
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8b(i) A current of 1.25A was passed through an electrolytic cell containing dil. H2SO4 for 40 minutes. Write a balanced equation for: I. oxidation half reaction II. reduction half reaction III. overall reaction.
Model answer
Oxidation half equation: 4OH⁻→2H2O+O2+4e⁻. Reduction half equation: 2H⁺(aq)+2e⁻→H2(g). Overall equation: 4OH⁻(aq)+4H⁺(aq)→2H2O(l)+H2(g)+O2(g).
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