Acidity is exhibited when an acid dissociates to produce protons (H⁺), which then hydrate to form hydronium ions in water. Without water, this ionization does not occur to a significant extent.
Why does dry HCl gas not change the colour of dry litmus paper?
Asked in BPSC Prelims Exam 68th · Topic: Acid, Base and Salt (Definitions of Acids and Bases (Arrhenius and Brønsted-Lowry concepts))
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Answer: B. No H3O+ ions are present. Litmus changes colour only in the presence of H3O+ ions.
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