Question

The presence of which of the following gases in air checks the ultraviolet rays from sunlight?

• A. SO${}_2$
• B. CO${}_2$
• C. NO
• D. O${}_3$

Answer 1

The correct option is D O${}_3$

At the higher levels of the atmosphere, ozone(O${}_3$) performs an essential function. It shields the surface of the Earth from ultraviolet (UV) radiation from the sun. This radiation is highly damaging to organisms, for example, it is known to cause skin cancer in human beings.

Hence, option D is correct.