(B) According to the Arrhenius theory,an acid is a substance that dissociates in water to produce $H^{+}$ ions.In the gaseous state,$HCl$ exists as a

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(B) According to the Arrhenius theory,an acid is a substance that dissociates in water to produce $H^{+}$ ions.In the gaseous state,$HCl$ exists as a covalent molecule and does not dissociate into ions.Therefore,gaseous $HCl$ does not behave as an Arrhenius acid because it cannot provide $H^{+}$ ions in the absence of an aqueous medium.