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Which of the following substances turns red litmus paper blue?

Answer and explanation

Correct answer: Sodium hydroxide solution

The indicator rule is that bases turn red litmus blue, whereas acids turn blue litmus red. Sodium hydroxide dissolves in water to give an alkaline solution, so it changes red litmus to blue and option C is correct. Lemon juice, vinegar, and dilute hydrochloric acid are acidic substances, so they cannot produce this change.

Related tags

Acids Bases SaltsLitmus IndicatorSodium HydroxideAcid Base PropertiesAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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