alleryStart learning →Rain is called acid rain when the pH of the rain water falls below about
A7.0
B8.5
C9.5
D5.6
Answer & Solution
Correct answer: D. 5.6
1. Normal rain is slightly acidic due to dissolved carbon dioxide.
2. When pollutant oxides push the pH lower, below about 5.6, it is acid rain.
3. Such rain harms aquatic life when it drains into rivers.
_Source: AP/TS SCERT Class 10 Physical Science, "Acids, Bases and Salts"_
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