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A turmeric stain becomes reddish brown when soap is applied. This indicates which nature of soap?

Answer and explanation

Correct answer: Basic nature

Turmeric is a natural acid-base indicator. Its yellow colour changes to reddish brown in a basic or alkaline medium. Since soap solution generally contains alkaline substances formed from a fatty acid and a strong base, it produces this colour change. Therefore, option B is correct. An acidic or neutral solution would not normally turn turmeric reddish brown, while metallic nature is unrelated to indicator behaviour. The substance should be tested safely rather than tasted or rubbed directly.

Related tags

TurmericNatural-IndicatorSoapBasic-SolutionAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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