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In an experiment an acidic gas does not affect dry litmus. What is the exam-based reason?

Answer and explanation

Correct answer: There is no water on dry litmus to form ions

Acidic behaviour in this test requires the gas to dissolve in water and ionise, producing hydrogen ions or hydronium ions that interact with the indicator. Dry litmus provides no water film, so the necessary ions are not formed at the indicator surface and no colour change is observed. Therefore A is correct; the gas still has chemical properties.

Related tags

Dry LitmusAcidic GasIonsAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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