A) dust
B) pesticides
C) \[S{{O}_{2}}\] and \[N{{O}_{2}}\]
D) carbon particle
Correct Answer: C
Solution :
R. August (1872) coined the term acid rain. Normal rainfall has a pH of 5.6 to 6.5 while acid rain has a pH of less than 5. Acid rain is caused by large scale emission of nitrogen oxides \[(N{{O}_{x}}),\] sulphur oxides \[(S{{O}_{x}}),\] volatile organic carbons and HCl from thermal power plant, industries and automobiles Sulphuric acids is formed when oxides of sulphur combine with water and oxygen. \[2S{{O}_{2}}+{{O}_{2}}\to 2S{{O}_{3}}\] \[S{{O}_{3}}+{{H}_{2}}O~\to {{H}_{2}}S{{O}_{4}}\] Nitric acid is formed when oxides of nitrogen combine with water and oxygen \[2N{{O}_{2}}+\frac{1}{2}{{O}_{2}}\to {{N}_{2}}{{O}_{5}}\] \[{{N}_{2}}{{O}_{5}}+{{H}_{2}}O\to 2HN{{O}_{3}}\]
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