Turmeric becomes reddish-brown in contact with what type of substance?
Answer and explanation
Correct answer: Basic substance
Turmeric contains a natural indicator substance, mainly curcumin. In its usual yellow form it changes to reddish-brown when it contacts a basic or alkaline substance, such as a soap solution. This colour change indicates basicity, so option B is correct. Acidic and neutral substances do not normally produce this reddish-brown turmeric test, and sugar is not the relevant chemical category.
Frequently asked questions
What is the correct answer to this question?
Basic substance
Why is this the correct answer?
Turmeric contains a natural indicator substance, mainly curcumin. In its usual yellow form it changes to reddish-brown when it contacts a basic or alkaline substance, such as a soap solution. This colour change indicates basicity, so option B is correct. Acidic and neutral substances do not normally produce this reddish-brown turmeric test, and sugar is not the relevant chemical category.
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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