What is the pH value of acid rain?
What is the pH value of acid rain?
ALess than 5.6
BMore than 5.6
CEqual to 7.0
DMore than 7.0
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correct answer is: option a : Less than 5.6
Explanation: Acid rain is defined as any precipitation with a pH less than 5.6. Normal rain is slightly acidic (around pH 5.6) due to the presence of atmospheric carbon dioxide, which dissolves to form weak carbonic acid. Acid rain is more acidic than this due to the presence of pollutants like sulfur dioxide and nitrogen oxides, which form stronger acids like sulfuric acid and nitric acid.
- Option a: Correct. Acid rain is defined as having a pH value less than 5.6.
- Option b: Incorrect. A pH greater than 5.6 indicates less acidity, not acid rain.
- Option c: Incorrect. A pH of 7.0 is neutral, and acid rain is acidic.
- Option d: Incorrect. A pH greater than 7.0 is basic/alkaline, not acidic.
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