$O_{3}$ in ozone layer is formed by action of

IR radiation

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Blue radiation

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UV radiation

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Other radiations

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Solution

The correct option is D UV radiation
Ozone molecule (O₃) is formed in the stratosphere in presence of UV radiations.
The first step is the breaking of an oxygen molecule into two oxygen atoms by UV radiation:
UV
$O_{2}$ ---------------> $O$ + $O$
The Oxygen atoms then combine with oxygen molecule to form a molecule of ozone:
$O_{2}$ + $O$ -----------------> $O_{3}$
So, the correct answer is 'UV radiation'.

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