11th Class Chemistry Environmental Chemistry

  • question_answer 52)   Ozone is a gas heavier than air. Why does ozone layer not settle down near the earth?


      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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