Question

Which of these reactions is not a part of breakdown of ozone in stratosphere?

• A. \(CF_2Cl_2(g)\xrightarrow{uv}\dot{C}l(g)+\dot{C}F_2Cl(g)\)
• B. \(C\dot{l}(g)+O_3(g)\rightarrow Cl\dot{O}(g)+O_2(g)\)
• C. \(Cl\dot{O}(g)+O(g)\rightarrow C\dot{l}(g)+O_2(g)\)
• D. \(2Cl\dot{O}\rightarrow ClO_2(g)+C\dot{l}(g)\)

Hint:

The breakdown of ozone in the stratosphere involves a catalytic cycle where chlorine atoms and chlorine monoxide are continuously regenerated to destroy ozone. Reactions outside this cycle are not part of the process.

Answer 1

The Correct Option is D

 The breakdown of ozone in the stratosphere is primarily due to catalytic cycles involving certain free radicals such as chlorine (\(Cl\)), bromine (\(Br\)), and others. These cycles involve a series of reactions that result in the conversion of ozone (\(O_3\)) into oxygen gas (\(O_2\)), while regenerating the free radical involved, thus continuing the cycle.

Let's analyze each given reaction to determine which one does not belong to the atmospheric breakdown of ozone:

1. \(CF_2Cl_2(g)\xrightarrow{uv}\dot{C}l(g)+\dot{C}F_2Cl(g)\)
2. \(C\dot{l}(g)+O_3(g)\rightarrow Cl\dot{O}(g)+O_2(g)\)
3. \(Cl\dot{O}(g)+O(g)\rightarrow C\dot{l}(g)+O_2(g)\)
4. \(2Cl\dot{O}\rightarrow ClO_2(g)+C\dot{l}(g)\)

Therefore, the reaction \(2Cl\dot{O}\rightarrow ClO_2(g)+C\dot{l}(g)\) is not a part of the breakdown of ozone in the stratosphere.