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For acid rain, the pH of rain water should be less than

Options

  1. A7.0
  2. B6.6
  3. C5.6
  4. D8.0

Correct answer

C. 5.6

Step-by-step solution

Normal rain water has a pH of about 5.6 due to the dissolution of atmospheric carbon dioxide, which forms carbonic acid ( H₂CO₃ ). When the pH of rain water drops below 5.6 , it becomes more acidic than normal and is classified as acid rain. Answer: 5.6

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