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Phenolphthalein turns pink and methyl orange turns yellow in a solution. What is the nature of this solution?

Answer and explanation

Correct answer: Basic

The governing concept is the characteristic colour range of acid-base indicators. Phenolphthalein is colourless in acidic or neutral solution but turns pink in a sufficiently basic solution. Methyl orange is yellow in neutral and basic conditions, so its yellow colour supports, but alone would not prove, basicity. Together the observations identify option A, a basic solution.

Related tags

PhenolphthaleinMethyl-OrangeBasic-SolutionIndicatorsAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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