Rain water becomes acidic, when the pH-value of rain water becomes _
Correct answer: D. Less than 5
- A. Greater than 6
- B. Greater than 6.5
- C. Less than 5.6
- D. Less than 5
Explanation
Normal clean rain has a pH value between 5.0 - 5.5, which is slightly acidic, however when rain combines with nitrogen oxides or SO2, it becomes more acidic has the pH drops below 5.0. Therefore the answer is D.
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