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B
CH4,O3
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C
NO2,SO2
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D
CO,CH4
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Solution
The correct option is CNO2,SO2 Processes involved in acid deposition (note that only SO2 and NOx play a significant role in acid rain). Acid rain is a rain or any other form of precipitation that is unusually acidic, meaning that it possesses elevated levels of hydrogen ions (low pH). It can have harmful effects on plants, aquatic animals and infrastructure. Acid rain is caused by emissions of sulphur dioxide and nitrogen oxide.