Acid rain generally has pH less than which value?
Answer and explanation
Correct answer: 5.6
Acid rain is rainfall with a pH generally below 5.6. Clean rainwater can have a pH of about 5.6 because dissolved carbon dioxide forms a weak acid; acids formed from sulfur dioxide and nitrogen oxides lower it further. A pH of 7.0 is neutral, so it is not the acid-rain limit. Exam tip: Remember the standard cutoff for acid rain as pH below 5.6.
Frequently asked questions
What is the correct answer to this question?
5.6
Why is this the correct answer?
Acid rain is rainfall with a pH generally below 5.6. Clean rainwater can have a pH of about 5.6 because dissolved carbon dioxide forms a weak acid; acids formed from sulfur dioxide and nitrogen oxides lower it further. A pH of 7.0 is neutral, so it is not the acid-rain limit. Exam tip: Remember the standard cutoff for acid rain as pH below 5.6.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Acids, Bases, and Salts.
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