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Why is red cabbage juice useful as an indicator?

Answer and explanation

Correct answer: It shows different colors in acids and bases

The governing concept is indicator behaviour: an indicator changes colour according to whether the medium is acidic or basic. Red cabbage juice contains anthocyanin pigments whose molecular form changes with pH, so different colours appear in acidic, neutral, and basic solutions. Option A is therefore correct. The juice does not transform substances into gold or gas and is not restricted to testing metals.

Related tags

Natural IndicatorRed CabbageAcid BaseAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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