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

Answer and explanation

Correct answer: Hydrochloric acid

Hydrochloric acid dissolves and ionises in water, producing H⁺ or H₃O⁺ ions. These ions are responsible for acidic behaviour and cause blue litmus paper to turn red. Sodium hydroxide is a base, calcium oxide forms a basic solution with water, and sodium chloride is approximately neutral. Thus only hydrochloric acid satisfies the stated test, making option B correct.

Related tags

ScienceClass10Acids-Bases-SaltsLitmusAcid-Base-IndicatorsHclAcidsBasesAnd SaltsAcids Bases And Salts

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