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Dry hydrogen chloride gas is passed over dry blue litmus paper and no colour change occurs. The same gas is passed over moist blue litmus paper and it turns red. What is the reason?

Answer and explanation

Correct answer: Ion formation in water is required for acidic behaviour

Hydrogen chloride shows acidic behaviour only after dissolving in water, where it ionises and produces hydronium ions: HCl + H₂O → H₃O⁺ + Cl⁻. Dry HCl gas cannot supply these aqueous ions to dry litmus, so there is no colour change. Moist litmus provides water and turns red; therefore option A is correct.

Related tags

Hydrogen-ChlorideLitmusAcidic-IonsAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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