Which substance can identify a basic solution as a natural indicator?
Answer and explanation
Correct answer: Turmeric
Turmeric contains the natural pigment curcumin, which acts as an acid-base indicator. It remains yellow in an acidic or neutral medium but changes to a reddish-brown colour in a basic medium, such as a soap solution. Therefore, turmeric in option A can identify a basic solution. Common salt, sugar, and pure water do not show this characteristic indicator colour change in the stated test.
Frequently asked questions
What is the correct answer to this question?
Turmeric
Why is this the correct answer?
Turmeric contains the natural pigment curcumin, which acts as an acid-base indicator. It remains yellow in an acidic or neutral medium but changes to a reddish-brown colour in a basic medium, such as a soap solution. Therefore, turmeric in option A can identify a basic solution. Common salt, sugar, and pure water do not show this characteristic indicator colour change in the stated test.
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.
