Acid rain is mainly caused by increased concentration (in atmosphere) of:
Correct answer: D. NO2 and SO2
- A. Ozone and dust
- B. NH3 and SO3
- C. CO and SO3
- D. NO2 and SO2
Explanation
Sulphur dioxide and nitrogen oxides are oxidised in the atmosphere and react with water to form sulphuric and nitric acids, which fall as acid rain. Ozone, dust and carbon monoxide are not the principal acid-rain-forming pair.
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