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A student says that dry hydrogen chloride gas will turn blue litmus paper red. What is the error in this statement?

Answer and explanation

Correct answer: Dry hydrogen chloride gas has no water, so it does not change dry litmus.

The error is ignoring the need for water in showing acidity. Dry hydrogen chloride molecules do not produce hydrogen ions on dry paper, so dry blue litmus remains unchanged. When the gas dissolves in moisture, it forms an acidic solution containing H⁺ ions and turns moist blue litmus red. Therefore option A is correct; B reverses the colour change, C wrongly calls HCl neutral, and D reverses the role of bases.

Related tags

Hydrogen ChlorideLitmus TestAcidic BehaviourWater RequirementAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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