When is rain considered acid rain?
Answer and explanation
Correct answer: When pH is less than 5.6
The governing concept is the pH scale and the natural acidity of rainwater. Carbon dioxide dissolves in rain and gives ordinary clean rain a slightly acidic pH of about 5.6. When atmospheric pollutants such as sulfur dioxide and nitrogen oxides form stronger acids and lower the rainwater pH below about 5.6, the precipitation is classified as acid rain. A pH of 7 is neutral, while 10 and 14 indicate alkaline solutions.
Frequently asked questions
What is the correct answer to this question?
When pH is less than 5.6
Why is this the correct answer?
The governing concept is the pH scale and the natural acidity of rainwater. Carbon dioxide dissolves in rain and gives ordinary clean rain a slightly acidic pH of about 5.6. When atmospheric pollutants such as sulfur dioxide and nitrogen oxides form stronger acids and lower the rainwater pH below about 5.6, the precipitation is classified as acid rain. A pH of 7 is neutral, while 10 and 14 indicate alkaline solutions.
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.
