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Oxidation of sulphur dioxide into sulphu...

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)`.

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The conversion of sulphur dioxide into sulphur trioxide is catalysed by the presence of particulates in the air.
`2SO_2 + O_2 overset(Particulates)to 2SO_3`
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