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Which of the following substances turns red litmus paper blue when dissolved in water?

Answer and explanation

Correct answer: Sodium hydroxide

Sodium hydroxide is a soluble base. When it dissolves in water, it produces hydroxide ions, OH⁻, making the solution alkaline; an alkaline solution turns red litmus paper blue. Therefore, option A is correct. Hydrochloric acid turns blue litmus red, whereas sodium chloride solution and distilled water are generally neutral and do not produce this change.

Related tags

Acids Bases SaltsLitmus PaperIndicatorsSodium HydroxideClass 10 ScienceAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And Behaviour

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