What colour does turmeric turn when it comes in contact with a basic substance?
Answer and explanation
Correct answer: Reddish brown
The governing concept is the colour response of natural indicators. Turmeric contains curcumin, which remains yellow in neutral or acidic conditions but changes to a reddish-brown colour in a basic medium. Therefore option A is correct. Blue is associated with the response of blue or red litmus in particular conditions, while green and white are not the characteristic turmeric response to a base. This property can demonstrate the alkalinity of substances such as soap, but unknown chemicals should not be tested by direct contact.
Frequently asked questions
What is the correct answer to this question?
Reddish brown
Why is this the correct answer?
The governing concept is the colour response of natural indicators. Turmeric contains curcumin, which remains yellow in neutral or acidic conditions but changes to a reddish-brown colour in a basic medium. Therefore option A is correct. Blue is associated with the response of blue or red litmus in particular conditions, while green and white are not the characteristic turmeric response to a base. This property can demonstrate the alkalinity of substances such as soap, but unknown chemicals should not be tested by direct contact.
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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