question_answer 35)

  The acids present in acid rain are : (a) peroxyacetyl nitrate                                (b) \[{{H}_{2}}C{{O}_{3}}\]           (c) \[HN{{O}_{3}}\]                          (d) \[{{H}_{2}}S{{O}_{4}}\]

Answer:

  (b, c, d) \[C{{O}_{2}}\] is slightly soluble in water forming carbonic acid. \[C{{O}_{2}}+{{H}_{2}}O\to {{H}_{2}}C{{O}_{3}}\] The oxides of nitrogen undergo oxidation reaction followed by reaction with water vapours to form nitric acid. \[NO+{{O}_{2}}\xrightarrow{{}}2N{{O}_{2}}\] \[2N{{O}_{2}}+{{H}_{2}}O\xrightarrow{{}}HN{{O}_{3}}+HN{{O}_{2}}\] The oxidation of \[S{{O}_{2}}\] into \[S{{O}_{3}}\] in presence of dust particles or metal ions. The \[S{{O}_{3}}\] then reacts with water vapours to form\[{{H}_{2}}S{{O}_{4}}\]. \[2S{{O}_{2}}+{{O}_{2}}\xrightarrow[or\,metal\,ions]{Dust\,particles}2S{{O}_{3}}\]                 \[S{{O}_{3}}+{{H}_{2}}O\xrightarrow{{}}{{H}_{2}}S{{O}_{4}}\]