What is the nature of a solution that turns red litmus paper blue?
Answer and explanation
Correct answer: Basic
The governing indicator rule is that a basic medium changes red litmus to blue. Bases produce hydroxide ions in aqueous solution, and the litmus dye responds with this characteristic colour change. Acids show the opposite effect on blue litmus, while a neutral solution normally does not turn red litmus blue. Hence option B is correct. The terms acidic, neutral, and oily do not explain the observed indicator response.
Frequently asked questions
What is the correct answer to this question?
Basic
Why is this the correct answer?
The governing indicator rule is that a basic medium changes red litmus to blue. Bases produce hydroxide ions in aqueous solution, and the litmus dye responds with this characteristic colour change. Acids show the opposite effect on blue litmus, while a neutral solution normally does not turn red litmus blue. Hence option B is correct. The terms acidic, neutral, and oily do not explain the observed indicator response.
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.
