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Acid rain is caused by increase in the atmospheric concentration of:
1. Ozone and dust
2. SO2 and NO2
3. CO
4. CFC

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Correct Answer - Option 2 : SO2 and NO2

The correct answer is SO and NO.

  • Acid rain is caused by a chemical reaction that begins when compounds like sulfur dioxide and nitrogen oxides are released into the air.
  • Acid rain refers to precipitation with a pH of less than 5.
  • These substances can rise very high into the atmosphere, where they mix and react with water, oxygen, and other chemicals to form more acidic pollutants, known as acid rain.
  • Human activities are the main cause of acid rain.
    • Power plants release the majority of sulfur dioxide and much of the nitrogen oxides when they burn fossil fuels, such as coal, to produce electricity.
    • Also, the exhaust from cars, trucks, and buses releases nitrogen oxides and sulfur dioxide into the air. These pollutants cause acid rain.

  • Chlorofluorocarbons (CFCs) are nontoxic, nonflammable chemicals containing atoms of carbon, chlorine, and fluorine.
    • They are used in the manufacture of aerosol sprays, blowing agents for foams and packing materials, solvents, and refrigerants.
    • In the atmosphere, CFCs drift slowly upward to the stratosphere, where they are broken up by ultraviolet radiation, releasing chlorine atoms, which can destroy ozone molecules.
    • CFCs are the main reason for the Ozone hole.

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