What colour does blue litmus turn in an acidic solution?
Answer and explanation
Correct answer: Red
The governing concept is the indicator test for acids and bases. Litmus is a natural acid–base indicator: in an acidic solution, blue litmus changes to red because the acidic medium affects the indicator dye. Blue is the unchanged colour in a neutral or non-acidic condition, while yellow and green are not the standard litmus result. Hence, option A, red, is correct.
Frequently asked questions
What is the correct answer to this question?
Red
Why is this the correct answer?
The governing concept is the indicator test for acids and bases. Litmus is a natural acid–base indicator: in an acidic solution, blue litmus changes to red because the acidic medium affects the indicator dye. Blue is the unchanged colour in a neutral or non-acidic condition, while yellow and green are not the standard litmus result. Hence, option A, red, 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.
