For acid rain, the pH of rain water should be less than
- A. 7.0
- B. 6.6
- C. 5.6 ✓
- D. 8.0
Correct Answer: C. 5.6
Explanation
Normal rain has a pH of about 5.6 due to dissolved carbon dioxide. When the pH level falls below 5.6, it becomes acid rain.
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