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Which of the following substances has an aqueous solution that turns red litmus paper blue?

Answer and explanation

Correct answer: Sodium hydroxide

Sodium hydroxide, NaOH, dissociates in water to form Na⁺ and OH⁻ ions. The hydroxide ions make the aqueous solution basic, and a basic solution changes red litmus paper to blue. Hydrochloric acid and carbon dioxide produce acidic solutions, while sodium chloride solution is approximately neutral. Therefore, sodium hydroxide is the only suitable answer, making option B correct.

Related tags

ScienceClass10Litmus-IndicatorSodium-HydroxideBasic-SolutionAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And Behaviour

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