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Ozone Layer Depletion

In the upper ...

Question

In the upper layers of atmosphere, ozone is formed ?

A

By action of electric discharge on oxygen molecules

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B

By action of ultraviolet rays on oxygen molecules

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C

By action of infrared rays on oxygen molecules

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D

Due to sudden drop of pressure

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Solution

The correct option is B By action of ultraviolet rays on oxygen molecules
In the upper layer of atmosphere, the Ultraviolet rays (UV rays) split the molecule of oxygen $(O_{2})$ into its constituent 2 atoms.
Each of the atom then combine with another oxygen $(O_{2})$ molecule which gives rise to Ozone $(O_{3})$ .
Hence option B is correct answer.

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