Why does a turmeric stain show a reddish-brown color when soap is applied?
Answer and explanation
Correct answer: Soap is basic and turmeric acts as an indicator
The governing concept is the use of natural acid–base indicators. Turmeric contains curcumin, which normally appears yellow but turns reddish-brown in a basic medium. Soap solution is generally basic because of its alkaline components. Consequently, option A correctly explains the stain. Soap is not an acid, turmeric does not become a metal, and the colour is not produced by carbon dioxide.
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What is the correct answer to this question?
Soap is basic and turmeric acts as an indicator
Why is this the correct answer?
The governing concept is the use of natural acid–base indicators. Turmeric contains curcumin, which normally appears yellow but turns reddish-brown in a basic medium. Soap solution is generally basic because of its alkaline components. Consequently, option A correctly explains the stain. Soap is not an acid, turmeric does not become a metal, and the colour is not produced by carbon dioxide.
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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