A) acid rain
B) smog
C) both [a] and [b]
D) none of the above
Correct Answer: C
Solution :
Acid rain and smog are examples of regional pollution. Acid rain is caused mainly by oxides of sulphur and nitrogen and has a pH of 4 or 4.5. Once in the air these oxides may react with moistur e to form \[{{H}_{2}}S{{O}_{4}}\] and \[HN{{O}_{3}}\]. \[S{{O}_{2}}\] Coxidized \[\xrightarrow{{}}\]\[S{{O}_{3}}+{{H}_{2}}O\xrightarrow{{}}{{H}_{2}}S{{O}_{4}}\] NO (oxidized) \[\xrightarrow{{}}N{{O}_{2}}+{{H}_{2}}O\xrightarrow{{}}HN{{O}_{3}}\] Smog is a harmful mixture of smoke and fog. It consists of a mixture of primary and secondary pollutants, (e.g., hydrocarbons,\[N{{O}_{2}},PAN,\,HCHO\]).
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