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A bulb glows in an aqueous acid but not in dry acidic gas. What is the correct reason?

Answer and explanation

Correct answer: Mobile ions are produced in the presence of water

An electric current in a solution requires mobile charged particles. An acid dissolved in water ionises, producing ions such as H₃O⁺ and a negative counter-ion that can move through the solution and carry charge, so the bulb glows. Dry hydrogen chloride gas does not provide freely moving ions in the same way, so it does not conduct sufficiently. Hence option A is correct; the other statements contradict ionic conduction.

Related tags

Aqueous-AcidIonsElectrical-ConductivityHydrogen-ChlorideAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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