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Science · 2023 · 3 marks
CBSE 2023 · Region 5 · Set 1 · Q33
How is ozone formed in the higher levels of the atmosphere ? "Damage to the ozone layer is a cause of concern." Justify this statement.
Marking-scheme solution
UV radiations act on the oxygen molecule \(\displaystyle \left(\mathrm{O}_{2}\right)\) and then split oxygen molecule into free (nascent) oxygen.
These free oxygen atoms combine with oxygen molecule \(\displaystyle \left(\mathrm{O}_{2}\right)\) to form ozone ( \(\displaystyle \mathrm{O}_{3}\) )
Alternate answer:
\[\begin{aligned}
& \mathrm{O}_{2} \longrightarrow \mathrm{UV} \mathrm{O}+\mathrm{O} \\
& \mathrm{O}+\mathrm{O}_{2} \longrightarrow \mathrm{O}_{3}
\end{aligned}
\]
Damage to ozone layer :
UV radiations reach the Earth and cause harmful effects like skin cancer in human beings.
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CBSE Class 10 Science past-paper question from the 2023board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.