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Option 2 : 2 and 4 only
The correct answer is 2 and 4 only.
Acid Rain
- The term ‘acid rain’ refers to the deposition of wet or dry acidic materials from the atmosphere on the earth’s surface.
- The phenomenon of Acid rain was discovered in the 19th century by Robert Angus Smith, a pharmacist from Manchester (United Kingdom), who noted that there were high levels of acidity in rain falling over industrial regions of England and compared them to the much lower levels of acidity in rain falling over less polluted areas near the coast and agricultural regions.
- Although most conspicuously associated with rainfall, the pollutants may fall on the earth’s surface either in the form of snow, sleet, hail, or fog or in the dry form of gases or particulate matter.
- Smokes emitted from the industries are the major source of sulfur dioxide whereas smoke emitted from the motor vehicle is the major source of nitrogen oxide. Hence only 2 and 4 are correct.
Sources of compounds causing acid rain:
Sulfur
- Natural Resources: - Seas and oceans, Volcanic eruptions, Biological processes in the soil e.g., Decomposition of Organic matter
- Man-made sources: - Burning of coal (60%), Petroleum products (30 % of S02) and smelting of metal sulfides ores to obtain the pure metals, Industrial production of sulphuric acid in metallurgical, chemical, and fertilizers industries.
Nitrogen
- Natural Resources: - Lightning, Volcanic eruptions
- Anthropogenic sources: - Forest fires, Combustion of Oil, Coal, And Gas
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