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About 20 km above the earth, there is an ozone layer. Which one of the following statements about ozone and ozone layer is true?

1. ozone has a triatomic linear molecule
2. it is harmful as it stops useful radiation
3. it is beneficial to us as it stops U.V radiation
4. conversion of O3 to O2 is an endothermic reaction

Correct answer: it is beneficial to us as it stops U.V radiation

Solution

The ozone layer is beneficial as it absorbs harmful ultraviolet (UV) radiation from the sun, protecting living organisms on Earth.

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