The statement that is not true about ozone is :

Question:

The statement that is not true about ozone is :

  1. in the stratosphere, CFCs release chlorine free radicals (Cl) which reacts with $\mathrm{O}_{3}$ to give chlorine dioxide radicals.

  2. in the atmosphere, it is depleted by CFCs.

  3.  in the stratosphere, it forms a protective shield against UV radiation.

  4. it is a toxic gas and its reaction with $\mathrm{NO}$ gives $\mathrm{NO}_{2}$.

Correct Option: , 2

Solution:

 In presence of sunlight CFC's molecule divides and release chlorine free radical, which react with ozone give chlorine monoxide radical $\left(\mathrm{ClO}^{\circ}\right)$ and oxygen.

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