Question

About 20 km above the earth, there is an ozone layer. Which one of the following statements about ozone and ozone layer is true?
(a) Ozone has a triatomic linear molecule
(b) It is harmful as it stops useful radiation
(c) It is beneficial to us as it stops U.V radiation
(d) Conversion of O₃ to O₂ is an endothermic reaction

Answer 1

(c) Ozone layer is beneficial to us, because it stops harmful ultraviolet radiations from reaching the earth.