How is ozone gas formed in the atmosphere?

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(B) Ozone is formed in the upper atmosphere by the action of $UV$ radiation on dioxygen $\left( O_2 \right)$ molecules. $1.$ The $UV$ radiations split

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By the action of $UV$ radiation on dioxygen molecules

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(B) Ozone is formed in the upper atmosphere by the action of $UV$ radiation on dioxygen $\left( O_2 \right)$ molecules. $1.$ The $UV$ radiations split molecular oxygen into free oxygen atoms: $O_2(g) \xrightarrow{UV} O(g) + O(g)$. $2.$ These free oxygen atoms then combine with molecular oxygen to form ozone: $O(g) + O_2(g) \rightleftharpoons O_3(g)$.

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