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An acidic gas has no effect on dry blue litmus but turns moist blue litmus red. Why?

Answer and explanation

Correct answer: Ions form in the presence of water

Acidic behaviour is produced by ions in an aqueous medium, especially hydrogen or hydronium ions. A dry acidic gas cannot ionise sufficiently on dry litmus, so no colour change is observed. Moisture dissolves the gas and permits ion formation; these ions cause blue litmus to turn red. Hence option A is correct, while the other explanations are scientifically irrelevant or false.

Related tags

Acidic GasMoist LitmusIonisationAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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