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If dry hydrogen chloride gas is passed over dry blue litmus paper, which conclusion is most correct?

Answer and explanation

Correct answer: Litmus will remain blue

Hydrogen chloride shows acidic behaviour only after dissolving in water and ionising to produce hydronium ions. Dry HCl gas passing over dry blue litmus has no available water, so the ions needed for the colour change are not formed and the paper remains blue. In moist conditions HCl would turn blue litmus red. Therefore option B is the precise conclusion.

Related tags

Dry Hydrogen ChlorideLitmusAcidic CharacterAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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