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An indicator shows red in acidic solution and yellow in basic solution. Which indicator could it be?

Answer and explanation

Correct answer: Methyl orange

Methyl orange is a synthetic acid-base indicator with a transition range in which it appears red in an acidic medium and yellow in a basic or sufficiently alkaline medium. Therefore option B matches both observations. Phenolphthalein is colourless in acid and pink in base; blue litmus changes to red in acid but does not become yellow in base; turmeric usually changes from yellow to reddish-brown in a base.

Related tags

Methyl OrangeIndicatorAcid BaseAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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