Answer:
In stratosphere, the formation
of \[{{O}_{3}}\] goes on continuously, but \[{{O}_{3}}\] is also decomposed by
UV-radiation between 240 to360 nm.
\[{{O}_{3}}+hv\xrightarrow{(240-360nm)}{{O}_{2}}+O\]
The O-atom reacts with second \[{{O}_{3}}\]
molecule.
\[{{O}_{3}}+O\to
2{{O}_{2}}\]
Net reaction \[2{{O}_{3}}\to
3{{O}_{2}}\]
Thus, the reactions form a
delicate balance in which the rate of \[{{O}_{3}}\] decomposition matches the
rate of \[{{O}_{3}}\] formation, i.e., a dynamic equilibrium exists and
maintains a constant concentration of\[{{O}_{3}}\].
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