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Chemical Properties of SO2 — Chemistry Keypoint

Chemical Properties of SO2

1. As an acid – It reacts with alkalis to form trioxosulphate (iv) salts.
2NaOH(aq) + SO2(g) →  Na2SO3(aq) + H2O(L)

2. As a reducing agent – It reduces oxidizing agents without leaving any traces of sulphur.
2KMnO4(aq) + 5SO2(g) + 2H2O(L)  → K2SO4(aq) + 2MnSO4(aq) + 2H2SO4

3. It can combine directly with metallic oxides to form salts.
PbO2(s) + SO2(g)  →  PbSO4(aq)

NB: 2SO2(s) + SO2(g) →  2SO3(g)

4. As an oxidizing agent –
C(s) + SO2(g) →  CO2(s)

NB: SO2 bleaches by reduction unlike chlorine which bleaches by oxidation.

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