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Ozone in the stratosphere is destroyed by:

Option: 1

CF_2Cl_2


Option: 2

PAN


Option: 3

C_6H_6


Option: 4

C_6F_6


Answers (1)

best_answer

CF_2Cl_2 is ozone depleting substance which causes ozone depletion in stratosphere

CFCs are released in the atmosphere and they mix with the normal atmospheric gases and eventually reach the stratosphere.

In stratosphere, they get broken down by powerful UV radiations, releasing chlorine free radical.

\mathrm{CF}_{2} \mathrm{Cl}_{2}(\mathrm{g}) \quad \stackrel{\mathrm{UV}}{\longrightarrow} \quad \dot{\mathrm{Cl}}(\mathrm{g})+\dot{\mathrm{C}} \mathrm{F}_{2} \mathrm{Cl}(\mathrm{g})
The chlorine radical then react with stratospheric ozone to form chlorine monoxide radicals and molecular oxygen.

\dot{\mathrm{C}} 1(\mathrm{g})+\mathrm{O}_{3}(\mathrm{g}) \rightarrow \mathrm{Cl} \dot{\mathrm{O}}(\mathrm{g})+\mathrm{O}_{2}(\mathrm{g})
Reaction of chlorine monoxide radical with atomic oxygen produces more chlorine radicals and the chain reaction continues

\mathrm{Cl} \dot{\mathrm{O}}(\mathrm{g})+\mathrm{O}(\mathrm{g}) \rightarrow \dot{\mathrm{C}} 1(\mathrm{g})+\mathrm{O}_{2}(\mathrm{g})

The chlorine radicals are continuously regenerated and cause the breakdown of ozone.

Hence, the correct answer is Option (1)

Posted by

Pankaj

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