Rainwater is called acid rain when its pH falls below which value?
Answer and explanation
Correct answer: 5.6
Rainwater naturally dissolves some carbon dioxide, so ordinary rain is slightly acidic and commonly has a pH near 5.6. It is classified as acid rain when its pH falls below about 5.6, usually because sulfur dioxide and nitrogen oxides form stronger acids in the atmosphere. Such rain can harm aquatic life, soil, plants, and buildings. Hence option A is correct; 7 is neutral, while 8.5 and 10 are alkaline values.
Frequently asked questions
What is the correct answer to this question?
5.6
Why is this the correct answer?
Rainwater naturally dissolves some carbon dioxide, so ordinary rain is slightly acidic and commonly has a pH near 5.6. It is classified as acid rain when its pH falls below about 5.6, usually because sulfur dioxide and nitrogen oxides form stronger acids in the atmosphere. Such rain can harm aquatic life, soil, plants, and buildings. Hence option A is correct; 7 is neutral, while 8.5 and 10 are alkaline values.
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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