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Question
State how CFC breaks the ozone layer.
Solution
Depletion of O3 by CFC:
CFC is broken by UV rays of sunlight to produce [Cl] atom or free radical [Cl] which is highly reactive in the atomic form and it forms ClO(g) with O2.
\[\ce{CFCl3->[UV(Sun)] CFCl2 + Cl(atom)}\]
\[\ce{Cl(g) + O3(g) → ClO(g) + O2(g)}\]
This depletes ozone.
ClO further produces more[Cl] free radical and destroys more of O3, thereby resulting in ozone depletion.
\[\ce{ClO(g) + O(g)→ Cl(g) + O2(g)}\]
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