question_answer 50)

  From where does ozone come in the photochemical smog?

Answer:

  Sunlight causes photochemical decomposition of \[N{{O}_{2}}\] into NO and O. \[N{{O}_{2}}+hv\to NO+O\] Atomic oxygen is a highly reactive species. It combines with diatomic oxygen and forms ozone. \[{{O}_{2}}+O+M\to {{O}_{3}}+M\] Where M is inert gas such as nitrogen. Thus, \[{{O}_{3}}\] is formed during the formation of smog.