Single correct option
Acid rain is caused mainly by the atmospheric release of oxides of
- A. carbon and hydrogen
- B. sulphur and nitrogen
- C. argon and helium
- D. calcium and magnesium
Show answer and solution
Answer: (B) sulphur and nitrogen
Burning fossil fuels releases sulphur dioxide and nitrogen oxides, which dissolve in rain water forming sulphuric and nitric acids and lowering the pH of rain below 5.6. These acids damage monuments, forests and aquatic life. Carbon dioxide mainly contributes to global warming, and noble gases do not react at all.
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