Why does a turmeric stain become reddish brown when soap is applied?
Answer and explanation
Correct answer: Soap is basic
The governing concept is the behaviour of a natural indicator. Turmeric remains yellow in an acidic or neutral medium but becomes reddish brown in a basic medium. Soap solution is generally basic because of its alkaline components, so option C correctly explains the colour change. Options A and B would not produce this characteristic reddish-brown turmeric colour.
Frequently asked questions
What is the correct answer to this question?
Soap is basic
Why is this the correct answer?
The governing concept is the behaviour of a natural indicator. Turmeric remains yellow in an acidic or neutral medium but becomes reddish brown in a basic medium. Soap solution is generally basic because of its alkaline components, so option C correctly explains the colour change. Options A and B would not produce this characteristic reddish-brown turmeric colour.
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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