Question:medium
About 20 km above the earth, there is an
ozone layer. Which one of the following
statements about ozone and ozone layer is
true?
About 20 km above the earth, there is an
ozone layer. Which one of the following
statements about ozone and ozone layer is
true?
Updated On: Jun 24, 2026
- Ozone is a triatomic linear molecule
- It is harmful as it stops useful radiation
- It is beneficial to us as it stops UV-radiation
- Conversion of $O_3 \, to \, O_2$ is an endothermic reaction
Show Solution
The Correct Option is C
Solution and Explanation
The question asks us to identify the true statement about ozone and the ozone layer from the given options. Let's examine each option to determine the correct one.
-
Ozone is a triatomic linear molecule.
- Ozone, represented as O_3, is a triatomic molecule, meaning it has three oxygen atoms. However, it is not a linear molecule; it has a bent shape. Therefore, this statement is false.
-
It is harmful as it stops useful radiation.
- Ozone in the ozone layer absorbs harmful ultraviolet (UV) radiation from the sun, preventing it from reaching the Earth's surface. This radiation is harmful to living organisms, and its absorption is beneficial. Thus, this statement is false.
-
It is beneficial to us as it stops UV-radiation.
- This statement is true. The ozone layer acts as a protective shield by absorbing the majority of the sun’s harmful UV radiation, protecting living organisms on Earth.
-
Conversion of O_3 \, to \, O_2 is an endothermic reaction.
- This statement is incorrect. The conversion of ozone (O_3) to oxygen (O_2) is an exothermic reaction, as it releases energy in the form of heat.
Therefore, the correct answer is: It is beneficial to us as it stops UV-radiation.
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