WAEC Chemistry 2019 Theory — Question 8
Question 8 of 28 from the West African Examinations Council (WAEC) Chemistry 2019 Theory paper, with the correct answer and a full explanation.
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1(h) Consider the reaction represented by the following equation: H2S + SO2 →(H+)→ S + H2O. State the: (i) species that is undergoing oxidation; (ii) Oxidizing agent [4 marks]
Model answer
(i) H2S undergoes oxidation — the oxidation number of sulphur increases from –2 in H2S to 0 in elemental sulphur, S. (ii) SO2 is the oxidizing agent — it undergoes reduction (its sulphur is reduced), and a species that is itself reduced acts as the oxidizing agent.
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