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Dry hydrogen chloride gas does not turn blue litmus red, but it does so after dissolving in water. What does this prove?

Answer and explanation

Correct answer: Formation of ions in water is necessary to show acidic character

The Arrhenius concept explains the observation: an acid produces hydrogen-related ions in aqueous solution. Dry HCl gas has no water medium in which HCl can ionise, so it does not supply hydrogen ions to the litmus and does not show the colour change. In water, HCl ionises essentially completely, producing H₃O⁺ ions, which turn blue litmus red. Therefore, A is correct; the other choices reverse or deny the observation.

Related tags

Dry-Hydrogen-ChlorideLitmusIons-In-WaterClass10AcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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