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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.

Related tags

Turmeric IndicatorSoapBasic NatureAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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