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Why do acidic properties become clear when hydrogen chloride gas dissolves in water?

Answer and explanation

Correct answer: Because hydrogen ions form in water

Acidic properties in aqueous solution arise from hydronium ions, H₃O⁺, formed when an acid transfers a proton to water. Hydrogen chloride ionises in water: HCl + H₂O → H₃O⁺ + Cl⁻. These mobile ions account for acidic indicators, electrical conduction and reactions with bases. Dry HCl gas does not show the same aqueous acidic behaviour because water is needed for ion formation. Therefore option A expresses the correct reason; the other choices are chemically incorrect.

Related tags

Hydrogen ChlorideHydronium IonsAcidic NatureAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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