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What is the main reason for the different effect of dry hydrogen chloride and moist hydrogen chloride on litmus?

Answer and explanation

Correct answer: Moisture helps ion formation

The governing concept is that acids show their characteristic properties through ions in aqueous solution. Dry hydrogen chloride gas does not produce hydrogen ions without water, so dry litmus shows no acidic colour change. In moisture, HCl dissolves and ionises as HCl + H₂O → H₃O⁺ + Cl⁻. The hydronium ions turn blue litmus red, making option A correct; the other statements contradict acid behaviour.

Related tags

Hydrogen ChlorideMoist LitmusIonsAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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