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What colour does phenolphthalein show in a basic solution?

Answer and explanation

Correct answer: Pink

Phenolphthalein is an acid–base indicator whose colour depends on the nature of the solution. It remains colourless in an acidic medium but changes to pink, or pinkish-red in stronger alkaline conditions, in a basic medium. Thus option C is the standard school-level answer. Red, green, and colourless do not represent its usual basic-solution colour.

Related tags

PhenolphthaleinBasic SolutionAcid-Base IndicatorAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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