What colour does turmeric show when it comes into contact with a basic substance?
Answer and explanation
Correct answer: Reddish-brown
Turmeric contains a natural indicator substance called curcumin. In an acidic or neutral medium, turmeric generally remains yellow, but in contact with a basic substance it changes to a reddish-brown colour. This colour change occurs because the indicator responds to the alkaline medium. Blue and green are not the characteristic turmeric response, and remaining yellow describes non-basic conditions. Therefore 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 indicator substance called curcumin. In an acidic or neutral medium, turmeric generally remains yellow, but in contact with a basic substance it changes to a reddish-brown colour. This colour change occurs because the indicator responds to the alkaline medium. Blue and green are not the characteristic turmeric response, and remaining yellow describes non-basic conditions. Therefore 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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