Acid rain is generally considered to have pH below which value?
Answer and explanation
Correct answer: 5.6
The governing concept is the pH scale and the natural acidity of rainwater. Unpolluted rain is mildly acidic, with pH about 5.6, mainly because atmospheric carbon dioxide dissolves in water to form weak carbonic acid. Rain with pH below approximately 5.6 is commonly classified as acid rain, often due to stronger acids formed from sulfur and nitrogen oxides. Values 7, 10, and 14 do not represent this threshold, so option A is correct.
Frequently asked questions
What is the correct answer to this question?
5.6
Why is this the correct answer?
The governing concept is the pH scale and the natural acidity of rainwater. Unpolluted rain is mildly acidic, with pH about 5.6, mainly because atmospheric carbon dioxide dissolves in water to form weak carbonic acid. Rain with pH below approximately 5.6 is commonly classified as acid rain, often due to stronger acids formed from sulfur and nitrogen oxides. Values 7, 10, and 14 do not represent this threshold, so option A is correct.
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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