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Dry hydrogen chloride gas has no effect on dry blue indicator paper. What is the most correct reason?

Answer and explanation

Correct answer: Acidic ions are not formed in the absence of water

Hydrogen chloride shows acidic behaviour only after dissolving in water, where it ionises and produces hydronium ions, H₃O⁺. Dry HCl gas cannot ionise on completely dry blue indicator paper, so the acid-sensitive colour change does not occur. It does not become a base, blue paper is not limited to bases, and gases still contain particles. Therefore option A is correct.

Related tags

Hydrogen ChlorideAcidic IonsIndicatorsAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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