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Dry hydrogen chloride gas has no effect on dry litmus but turns blue litmus red after dissolving in water. What is the reason?

Answer and explanation

Correct answer: Hydrogen ions form in water

Hydrogen chloride shows its acidic behaviour only when water allows it to ionise. In water, HCl produces hydronium ions, H₃O⁺, which cause blue litmus to turn red. Dry HCl gas and dry litmus do not provide the aqueous medium needed for this ion formation, so no colour change occurs. Therefore option A explains both observations; the other choices are incorrect.

Related tags

Hydrogen ChlorideDry LitmusAcid IonsAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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