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How does SO2 react with the following? (i) Na2SO3(aq) (ii) Cl2 (iii) Fe+3ions (iv) KMnO4 |
Answer» (i) Sodium sulphite (aq) reacts with So2 to form sodium hydrogen sulphite. Na2SO3 + H2O + SO2 → 2NaHSO3 (ii) SO2 gas reacts with chlorine gas in the presence of charcoal to form suphuryl chloride. SO2(g) + Cl2(g) → SO2Cl2(l) (iii) Fe+3ions are reduced to Fe+2 ions by SO2. 2Fe+3+ SO2 + 2H2O → 2Fe+2 + SO–24 + 4H+ (iv) SO2 gas decolourises acidified potassium permanganate 5SO2 + 2MnO–4 + 2H2O → 5SO–24 + 4H++ 2Mn+2 |
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