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Which statement is correct about dry hydrogen chloride gas?

Answer and explanation

Correct answer: It turns moist blue litmus paper red but has no effect on dry litmus paper.

The governing idea is that hydrogen chloride shows acidic behaviour in the presence of water. Dry HCl gas cannot release hydrogen ions on completely dry litmus, so dry blue litmus does not change. In moisture, HCl dissolves and forms an acidic solution, turning blue litmus red. Thus option B is correct; it also rejects the opposite colour change and the incorrect claim of neutrality.

Related tags

Hydrogen ChlorideLitmus IndicatorAcidic BehaviourMoisture EffectAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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