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 NO₂ .

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

(4) in the stratophere, CFCs release chlorine free radicals (Cl)& which reacts with O₃ to give chlorine dioxide radicals.

Answer 1

Answer is (4) in the stratophere, CFCs release chlorine free radicals (Cl)& which reacts with O₃ to give chlorine dioxide radicals.

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

which react with O₃ to give chlorine oxide (ClO) & radical not chlorine dioxide (ClO₂) & radical.

Cl(g) + O₃ (g) → ClO(g) + O₂(g)