A) 7
B) 6.5
C) 6
D) 5.6
Correct Answer: D
Solution :
Acid rain results from air pollution by oxides of nitrogen \[(N{{O}_{x}})\] and sulphur\[(S{{O}_{x}})\]. These gases react with water and form acids. \[S{{O}_{2}}+{{H}_{2}}O\xrightarrow{{}}{{H}_{2}}S{{O}_{3}}\] \[S{{O}_{3}}+{{H}_{2}}O\xrightarrow{{}}{{H}_{2}}S{{O}_{4}}\] \[{{N}_{2}}{{O}_{5}}+{{H}_{2}}O\xrightarrow{{}}2HN{{O}_{3}}\] When the pH of rain is below 5.6, it is called acid rain.
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