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  • Which of the following statements about  the depletion of ozone layer is correct?Option: 1 The problem of ozone depletion is less serious a

Which of the following statements about  the depletion of ozone layer is correct?

Option: 1

The problem of ozone depletion is less serious at poles because NO2 solidifies and is not available for consuming ClO• radicals.


Option: 2

The problem of ozone depletion is  more serious at poles because ice  crystals in the clouds over poles act as  catalyst for  photochemical reactions involving the decomposition of ozone by Cl• and ClO• radicals.


Option: 3

Freons, chlorofluorocarbons, are  inert chemically, they do not react  with ozone in stratosphere.


Option: 4

Oxides of nitrogen also do not react  with ozone in stratosphere.


Answers (1)

O_{3}+\overset \odot Cl\rightarrow \overset \odot ClO+O_{2}

\overset \odot ClO+O\rightarrow \overset \odot Cl+O_{2}

Now, polar stratospheric clouds are made of nitric acid and water crystals which act as a catalyst for ozone depletion. 

Therefore, option (2) is correct.

Posted by

Kshitij

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