Question

Maximum ozone depletion is caused by

• A. $C{O}_2$
• B. CFC
• C. $S{O}_2$
• D. $C{H}_4$

Answer 1

The correct option is B CFC

The primary cause for ozone depletion are CFCs. CFCs or Chlorofluorocarbons are the compounds that contain carbon and hydrogen along with chlorine and fluorine. They are used as refrigerants and in air conditioners. CFCs release chlorine radicals that react with ozone and cause its degradation. The mechanism of ozone depletion by CFC is as follows:

UV- C

CFCl₃ ----------------> CFCl₂ + Cl

UV-C

CFCl₂ -----------------> CFCl + Cl

Cl + O₃ ----------------> ClO + O₂

ClO + O₃ --------------> Cl + 2O₂

Hence, CFC causes degradation of ozone. Also, the chlorine atom remains in the atmosphere and reacts with another molecule of ozone.

So, the correct answer is 'CFC'.