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An acidic gas changes the colour of moist litmus but has no effect on dry litmus. Why does it not affect dry litmus?

Answer and explanation

Correct answer: Ions cannot form without water

Acidic behaviour is observed when the gas dissolves in water and produces ions, especially hydrogen ions or hydronium ions, that interact with the indicator. Moist litmus supplies the necessary water, so the colour changes. Dry litmus has no sufficient water medium for ionisation and the characteristic acidic response is not produced. Thus option A is correct. Dry litmus is not inherently basic, and the other statements are unrelated to indicator chemistry.

Related tags

Dry LitmusAcidic GasIonisation In WaterAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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