JEE Main2014ChemistryEnvironmental ChemistryActual
Which of the following statements about the depletion of ozone layer is correct?
Options
- AThe problem of ozone depletion is less serious at poles because NO ₂ solidifies and is not available for consu
- BThe problem of ozone depletion is more serious at poles because ice crystals in the clouds over poles act as c
- CFreons, chlorofluorocarbons, are inert. Chemically, they do not react with ozone in stratosphere.
- DOxides of nitrogen also do not react with ozone in stratosphere.
Correct answer
C. Freons, chlorofluorocarbons, are inert. Chemically, they do not react with ozone in stratosphere.
Step-by-step solution
Freons and chlorofluorocarbon find their way to stratosphere through without being destroyed in the troposphere due to their low reactivity. In the stratosphere the Cl and Br atoms are liberated from the parent compounds by the action of ultraviolet light e.g. aligned & CF ₂ Cl ₂+h v CF ₂ Cl + Cl & CFCl ₃+h v CFCl ₂+ Cl aligned The Cl atoms can destroy ozone molecules through a variety of catalytic cycles.