What colour does red litmus paper turn in a basic solution?
Answer and explanation
Correct answer: Blue
Litmus helps distinguish acidic and basic solutions. A basic solution changes red litmus paper to blue because the alkaline medium produces the characteristic response of the litmus indicator. Hence option B is correct. Red litmus does not remain the expected test colour in a base, and the change is not to white or black. This test should be performed with a suitable indicator strip rather than by touching or tasting an unknown chemical.
Frequently asked questions
What is the correct answer to this question?
Blue
Why is this the correct answer?
Litmus helps distinguish acidic and basic solutions. A basic solution changes red litmus paper to blue because the alkaline medium produces the characteristic response of the litmus indicator. Hence option B is correct. Red litmus does not remain the expected test colour in a base, and the change is not to white or black. This test should be performed with a suitable indicator strip rather than by touching or tasting an unknown chemical.
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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