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Why will the same gas change colour on moist blue indicator paper?

Answer and explanation

Correct answer: Moisture helps the gas form ions

Moisture supplies the water needed for hydrogen chloride to dissolve and ionise: HCl + H₂O → H₃O⁺ + Cl⁻. The hydronium ions give the solution acidic character, so the blue indicator changes to red. Moisture does not turn a gas into a metal, wet paper is not naturally always red, and water does not make every gas basic. Thus option A explains the observation.

Related tags

Hydrogen ChlorideMoist IndicatorIonisationAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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