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.
This question appeared on the ETEA MDCAT 2013 paper, which you can sit online with every answer explained.
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