The statement that is not true about ozone is :

Question:

The statement that is not true about ozone is :

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

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

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

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


Correct Option: , 4

Solution:

In the stratosphere, CFCs release chlorine free radical (Ci)

$\mathrm{CF}_{2} \mathrm{Cl}_{2}(\mathrm{~g}) \stackrel{\mathrm{uV}}{\longrightarrow} \mathrm{Cl}(\mathrm{g})+\dot{\mathrm{CF}}_{2} \mathrm{Cl}(\mathrm{g})$

which react with $\mathrm{O}_{3}$ to give chlorine oxide ( $\mathrm{Cl} \mathrm{O}$ ) radical not chlorine dioxide $\left(\mathrm{ClO}_{2}\right)$ radical.

$\mathrm{Cl}(\mathrm{g})+\mathrm{O}_{3}(\mathrm{~g}) \rightarrow \mathrm{Cl} \dot{\mathrm{O}}(\mathrm{g})+\mathrm{O}_{2}(\mathrm{~g})$

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