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Question

Ozone is formed in the upper atmosphere from oxygen by the action of:

A
UV rays
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B
Cosmic rays
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C
Free radicals
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D
Nitrogen oxides
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Solution

The correct option is A UV rays
UV rays act on oxygen molecules in the upper atmosphere and splits the oxygen molecule into two oxygen atoms. This is called photolysis. The oxygen atom formed by photolysis combines with molecular oxygen forming ozone.

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