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NDA 1 2025 GAT, question 85

Topic: Environment and ecology

Q85

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

  1. (a) 7.0
  2. (b) 6.6
  3. (c) 5.6Correct answer
  4. (d) 8.0

Solution.

Answer: (c) 5.6

  1. Unpolluted rain is already mildly acidic because dissolved carbon dioxide forms carbonic acid.
  2. Its conventional reference pH is about 5.6.
  3. Acid rain is more acidic than this baseline, with pH below 5.6; simply being below neutral pH 7 is not sufficient.