Turmeric as a natural indicator is especially useful for identifying which type of solution?
Answer and explanation
Correct answer: Basic solution
The governing concept is the colour change of a natural acid-base indicator. Turmeric contains curcumin, which remains yellow in its ordinary form but changes to a reddish-brown colour in a basic medium. Therefore turmeric paper is especially useful for detecting alkaline solutions. Neutral water generally causes no characteristic change, and the test is not a universal test for gases or metals. The observation identifies basicity rather than a particular substance, so option A is correct.
Frequently asked questions
What is the correct answer to this question?
Basic solution
Why is this the correct answer?
The governing concept is the colour change of a natural acid-base indicator. Turmeric contains curcumin, which remains yellow in its ordinary form but changes to a reddish-brown colour in a basic medium. Therefore turmeric paper is especially useful for detecting alkaline solutions. Neutral water generally causes no characteristic change, and the test is not a universal test for gases or metals. The observation identifies basicity rather than a particular substance, so option A 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.
