MEDIUMMCQ SINGLEIChO (Chemistry Olympiad)Inorganic ChemistryEnvironmental ChemistryO3, NO2 acrolein, formaldehyde and PAN

Which of the following protect us from the harmful UV-radiation coming from the sun? I. O2 II. O3 III. N2 IV. CO2

A.I and II

B.II and IV

C.II only✓ Correct

D.I and IV

Explanation

The stratosphere consists of considerable amount of ozone (O3) which protect us from the harmful ultraviolet (UV) radiations (=255nm) coming from the sun.

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