Question:
In stratosphere most of the ozone formation is assisted by :
Correct Option: , 3
Solution:
Ozone in the stratosphere is a product of UV radiations acting on dioxygen $\left(\mathrm{O}_{2}\right)$ molecules.
$\mathrm{O}_{2}(\mathrm{~g}) \stackrel{\mathrm{UV}}{\longrightarrow} \mathrm{O}(\mathrm{g})+\mathrm{O}(\mathrm{g})$
$\mathrm{O}(\mathrm{g})+\mathrm{O}_{2}(\mathrm{~g}) \stackrel{\mathrm{UV}}{\rightleftharpoons} \mathrm{O}_{3}(\mathrm{~g})$