Ncert Exercises & Solutions

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?

The oxidation of sulphur dioxide into sulphur trioxide can occur both photochemically or non-photochemically. In the near ultraviolet region, the SO₂ molecules react with ozone photochemically.

{SO}_{2} + O_{3} \overset{hv}{\to} {SO}_{3} + O_{2}

2 {SO}_{2} + O_{2} \overset{hv}{\to} 2 {SO}_{3}

Non-photochemically, SO₂ may be oxidised by molecular oxygen in presence of dust and soot particles.

2 {SO}_{2} + O_{2} \overset{Particulates}{\to} 2 {SO}_{3}

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