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What happens to the colour of moist blue litmus paper when it is exposed to hydrogen chloride gas?

Answer and explanation

Correct answer: It will turn red

The governing concept is that hydrogen chloride shows acidic behaviour only after dissolving in water. Moisture on the litmus paper allows HCl gas to dissolve and ionise, producing hydrochloric acid and hydrogen ions: HCl(aq) → H⁺ + Cl⁻. These ions turn blue litmus red. Dry HCl gas cannot ionise effectively without water, so the word “moist” is essential. Hence option A is correct.

Related tags

Hydrogen ChlorideLitmus PaperAcidsIndicatorsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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