Question

\[CFC{l_3}\] ​is responsible for the decomposition of ozone. Which of the following reacts with ozone to form oxygen?
\[
  A.Cl \\
  B.C{l^ - } \\
  C.C{l_2} \\
  D.{F^ - } \\
 \]

Answer 1

Hint: We must know that the \[CFC{l_3}\] in the presence of light forms Chlorine radical. And this chlorine radical can easily react with ozone molecules \[({O_3})\].

Complete step by step answer:
Let’s start with discussing the decomposition of ozone. Decomposition of ozone famously known as ozone depletion is the world's known threat to humanity and all the lives on earth. In this the ozone which generally protects us from UV radiations from sunlight gets depleted/decomposed due to many factors. Ozone is depleted into oxygen $(O_2)$ which doesn’t protect us at all. Generally, ozone is poisonous for humans if inhaled but it’s too high into the atmosphere that we are not worried about that, what we are worried about is its decomposition.
Now, coming back to the question \[CFC{l_3}\] decomposes the ozone to oxygen the reaction is given below:
\[CFC{l_{3}}\xrightarrow{{hv}}\dot Cl{\text{ }} + {\text{ }}\dot CFCl_2\]
\[CFC{l_3}\] in the presence of light forms Chlorine radical ($Cl$). The chlorine radical reacts with ozone i.e. \[{O_3}\] through a series of chain reaction as given below
\[\dot Cl + {O_3}{\text{ }} \to Cl\dot O + {O_2}\]
\[Cl\dot O + O \to \dot Cl + {O_2}\]
Hence, the answer to this question is chlorine radical which is formed when $CFCl_3$ is in the presence of light.
So, the answer to this is option A. $Cl$.

Note:
We must know that the ozone is poisonous when inhaled but still has many benefits for humans, one being the protection it provides against UV radiation and also its effect in strengthening the immune system of humans. It stimulates the white blood cells; prevents infections and immune system deficiencies by destroying fungi, bacteria and viruses. It also helps in counteract cell mutation. It is also used for cleaning the fruit and vegetables.