Question
Acid rain is caused by the pollution of environment by
(a) carbon dioxide and nitrogen
(b) carbon monoxide and carbon dioxide
(c) ozone and carbon dioxide
(d) nitrous oxide and sulphur dioxide
Answer:
D
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Explanation:
Acid rain is primarily caused by the pollution of the environment by certain gases, particularly sulphur dioxide (SO2) and nitrogen oxides (NOx). These gases are emitted into the atmosphere as a result of various human activities, including the burning of fossil fuels, industrial processes, and transportation.
Sulphur dioxide (SO2) is released mainly from the combustion of fossil fuels containing sulphur, such as coal and oil. Nitrogen oxides (NOx) are primarily emitted from the burning of fossil fuels in vehicles, power plants, and industrial boilers.
When sulphur dioxide and nitrogen oxides are released into the atmosphere, they undergo chemical reactions with water, oxygen, and other compounds to form sulphuric acid (H2SO4) and nitric acid (HNO3). These acids dissolve in rainwater and other forms of precipitation, leading to the phenomenon known as acid rain.