question_answer 22)

  Photo chemical smog occurs in warm, dry and sunny climate. One of the following is not amongst the components of photo chemical smog, identify it: (a)\[N{{O}_{2}}\]                                             (b) \[{{O}_{3}}\]                                               (c) \[S{{O}_{2}}\]                                              (d) unsaturated hydrocarbon

Answer:

  (c) The smog which is formed in presence of sunlight is called photochemical smog. This occurs in the months of summer when \[N{{O}_{3}}\] and hydrocarbons are present in large amounts in atmosphere. Concentration of\[{{O}_{3}}\], PAN and aldehydes and ketones builds up in the atmosphere. \[S{{O}_{2}}\]is not responsible for photochemical smog.