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Why does dry hydrogen chloride gas not turn dry blue litmus paper red?

Answer and explanation

Correct answer: Hydrogen ions do not form without water

Hydrogen chloride shows acidic behaviour when it dissolves in water and ionises, producing hydronium ions, H₃O⁺, which are responsible for the acidic reaction. Dry HCl gas in contact with dry blue litmus has no water available for this ionisation, so the ions are not produced and the litmus remains unchanged. Hence option A is correct; colourlessness or basicity is unrelated to the result.

Related tags

ScienceClass10Dry-HclIonsLitmusAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And Behaviour

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