UPSC Prelims 2013 · Question 80 of 99

UPSC Prelims 2013 question on Acid Rain Causes

Acid rain is caused by the pollution of environment by:

  1. Carbon dioxide and nitrogen
  2. Carbon monoxide and carbon dioxide
  3. Ozone and carbon dioxide
  4. Nitrous oxide and sulphur dioxide
Show answer

Answer: D. Nitrous oxide and sulphur dioxide

Analysis

Acid rain is mainly caused by sulphur dioxide (SO₂) and nitrogen oxides released from industries, thermal power plants, and vehicles. These gases react with water vapour in the atmosphere to form sulphuric acid and nitric acid, which fall as acid rain. Therefore, nitrous oxide and sulphur dioxide are the correct pollutants among the given options.

Extra UPSC info

Acid rain can damage forests, aquatic ecosystems, buildings, and historical monuments.

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