Oxidation of Sulphur dioxide into Sulphur trioxide in the absence of a catalyst is a slow process but this oxidation occurs easily in the atmosphere. Explain how does this happen. Give chemical reactions for the conversion of SO_{2} into SO_{3}.

Answers (1)

Oxidation of sulphur without a catalyser can be remarkably slow; however, polluted air contains particulate matter which catalysis the reaction of SO_{2} to SO_{3}.

2SO_{2}(g) + O_{2}(g) \rightarrow 2SO_{3}(g)

This reaction can also be promoted by hydrogen peroxide or ozone

SO_{2}(g) + O_{3}(g) \rightarrow 2SO_{3}(g) + O_{2}(g)

SO_{2}(g) + H_{2}O_{2}(l) \rightarrow H_{2}SO_{4}(aq)

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