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Why does a dry acidic gas not change dry litmus?

Answer and explanation

Correct answer: Ions do not form without water

The governing concept is that acidic behaviour in aqueous conditions depends on the formation of hydrogen ions, or hydronium ions, in water. A dry acidic gas has no water available to ionise it, and dry litmus cannot provide the aqueous medium needed for this ion formation. Therefore no colour change occurs and option A is correct. Litmus is an indicator, not a metal, and indicators do work when moisture is present.

Related tags

Acids Bases SaltsDry LitmusIonsIndicatorsClass 10 ScienceAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And Behaviour

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