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ICSE Class 9 Chemistry Question 14 of 31

Atmospheric Pollution — Question 26

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Question

Question 26

Give balanced equations for formation of ozone molecules from oxygen molecules. What type of reaction takes place, during the formation.

Answer

Highly energetic ultraviolet radiations from the sun breaks the oxygen molecule [O2] into two oxygen atoms. This reaction is photodissociation or photolysis.

Highly reactive oxygen atom [O] can then react with oxygen molecule [O2] to form ozone [O3]

O2 →lightU.V.\xrightarrow[\text{light}]{\text{U.V.}} [O] + [O]

O2 + [O] ⟶ O3 [ozone]