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Why does dry hydrogen chloride gas not affect dry litmus paper?

Answer and explanation

Correct answer: Water is needed to form ions

The governing concept is that acidic behaviour requires ions in an aqueous medium. Hydrogen chloride molecules do not release mobile hydrogen ions merely because they are present as dry gas; in water they ionise, represented as HCl + H2O → H3O+ + Cl−. Dry litmus therefore shows no acidic colour change. Option A is correct. Litmus can respond to acids as well as bases, HCl is not basic, and the important missing condition is water rather than total chemical inactivity of litmus.

Related tags

Hydrogen ChlorideLitmusAqueous IonsAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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