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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.

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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 SO2 into SO3.

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The presence of particulate matter in polluted air catalyses the oxidation of SO2 to SO3 .The reaction is also promoted by ozone and hydrogen peroxide.

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