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A student placed dry hydrogen chloride gas and dry blue litmus paper in a closed jar. The litmus showed no colour change. What is the correct reason for this observation?

Answer and explanation

Correct answer: In the absence of water, hydrogen chloride does not ionise to form acidic ions.

Hydrogen chloride shows acidic behaviour only after dissolving in water, when it ionises to form \(H_3O^+\) ions. With dry gas and dry litmus paper, water is absent; therefore, blue litmus does not turn red. Option B is incorrect because blue litmus turns red in an acidic solution.

Related tags

Acids Bases SaltsHydrogen ChlorideLitmus PaperIndicatorsIonisationWater

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