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Question
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.
Solution
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.
\[\ce{2SO2 + O2 ->[Dust or soot particles] 2SO3}\]
\[\ce{SO2 + O3 ->[hv] SO3 + O2}\]
\[\ce{SO2 + H2O2 -> H2O + SO3}\]
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