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Which of the following substances acts as an indicator by changing colour in the presence of acids and bases?

Answer and explanation

Correct answer: Litmus

An indicator is a substance that gives a characteristic colour change according to whether a solution is acidic or basic. Litmus is a natural indicator: blue litmus turns red in acid, and red litmus turns blue in a base. Thus option A is correct. Sodium chloride solution, glucose solution, and distilled water do not normally show this acid-base colour change.

Related tags

Acids Bases SaltsIndicatorsLitmusColour ChangeChemical PropertiesAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And Behaviour

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