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Ozone Layer Depletion

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Question

A considerable part of harmful ultraviolet radiation from the sun does not reach the surface of the earth. This is because high above the earth's atmosphere is a layer of ---------.

A

Carbon dioxide

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B

Hydrogen

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C

Ozone

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D

Nitrogen

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Solution

The correct option is C Ozone
The presence of the layer of ozone prevents the UV rays from reaching the surface of the earth.

The reactions that occur are shown below:
$O_{3} h ν \to O_{2} + [O]$
$2 O_{3} h ν \to 3 O_{2}$

Thus, the correct answer is option C.

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