What colour does turmeric become in contact with a basic substance?
Answer and explanation
Correct answer: Reddish-brown
Turmeric contains a natural pigment that acts as an acid-base indicator. In its usual form it is yellow, but when it contacts a basic substance, the pigment changes to a reddish-brown colour. This change is useful for recognizing alkaline materials. The yellow colour is the original turmeric colour, while green and blue are not the characteristic basic reaction of turmeric. Hence, option B is correct.
Frequently asked questions
What is the correct answer to this question?
Reddish-brown
Why is this the correct answer?
Turmeric contains a natural pigment that acts as an acid-base indicator. In its usual form it is yellow, but when it contacts a basic substance, the pigment changes to a reddish-brown colour. This change is useful for recognizing alkaline materials. The yellow colour is the original turmeric colour, while green and blue are not the characteristic basic reaction of turmeric. Hence, option B 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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