Why normal rain is slightly acidic?
Correct answer: B. carbon dioxide and water in clouds react to form carbonic acid
- A. due to presence of dust in air
- B. carbon dioxide and water in clouds react to form carbonic acid
- C. Ozone depletion
- D. All of these
Explanation
Rain absorbs atmospheric carbon dioxide, forming weak carbonic acid and giving normal rain a mildly acidic pH. Ozone depletion and dust are not the basic chemical cause of ordinary rain's acidity.
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