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Why does dry hydrogen chloride gas not change the colour of dry litmus?

Answer and explanation

Correct answer: Ions do not form without water

The governing concept is that hydrogen chloride shows acidic behaviour only after dissolving in water. In moist conditions, HCl ionises in water and produces hydronium ions, which change blue litmus to red. Dry HCl gas and dry litmus contain no water medium, so the necessary ions are not formed and no colour change occurs. Thus option A is correct; the gas is not basic, litmus is not a metal, and colourlessness is irrelevant.

Related tags

ScienceClass10Acids-Bases-SaltsHydrogen-ChlorideLitmusAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And Behaviour

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