In a solution, red litmus turns blue, but blue litmus shows no change. What type of solution is it?
Answer and explanation
Correct answer: Basic
The governing concept is the colour response of litmus in basic media. A base changes red litmus to blue because hydroxide ions create alkaline conditions. Blue litmus remains blue in the same solution, so the two observations agree. An acid would produce the opposite change, while a neutral solution would change neither strip. Thus, option D, basic, is correct.
Frequently asked questions
What is the correct answer to this question?
Basic
Why is this the correct answer?
The governing concept is the colour response of litmus in basic media. A base changes red litmus to blue because hydroxide ions create alkaline conditions. Blue litmus remains blue in the same solution, so the two observations agree. An acid would produce the opposite change, while a neutral solution would change neither strip. Thus, option D, basic, 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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