Question

Explain the formation of ozone. [2 MARKS]

Answer 1

Each point: 1 Mark

1. Ozone at the higher levels of the atmosphere is a product of UV radiation acting on oxygen (O₂) molecule. The higher energy UV radiations split apart some moleculer oxygen (O₂) into free oxygen (O) atoms. These atoms then combine with the molecular oxygen to form ozone as shown-

2. ${\text{O}}_2$ $\stackrel{UV}{\to }$ $\text{O + O}$

$\text{O}$+${\text{O}}_2$ $\to$ ${\text{O}}_3$ (Ozone)