If a salt solution has no effect on either blue or red litmus paper, what may be its approximate pH?
Answer and explanation
Correct answer: 7
The governing concept is the pH scale and the behaviour of indicators. A solution that changes neither blue litmus nor red litmus is approximately neutral, so its pH is close to 7 at room temperature. Therefore, option B is correct. A pH of 2 is acidic, while pH values 12 and 14 are strongly basic and would affect red litmus.
Frequently asked questions
What is the correct answer to this question?
7
Why is this the correct answer?
The governing concept is the pH scale and the behaviour of indicators. A solution that changes neither blue litmus nor red litmus is approximately neutral, so its pH is close to 7 at room temperature. Therefore, option B is correct. A pH of 2 is acidic, while pH values 12 and 14 are strongly basic and would affect red litmus.
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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