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ICSE Class 9 Chemistry Question 31 of 31

Atmospheric Pollution — Question 6

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Question

Question 3.4

Give reasons for the following.

The formation of ozone involves a chemical reaction called photolysis.

Answer

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

The 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]