• # question_answer22)   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

(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.