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Which pair reacts to form a salt and hydrogen gas?

Answer and explanation

Correct answer: Acid and reactive metal

A sufficiently reactive metal can displace hydrogen from a dilute acid. The products are a salt and hydrogen gas; for example, Zn + 2HCl → ZnCl₂ + H₂. Therefore, option A is correct. Acid and base usually undergo neutralisation to form salt and water, while acid and metal carbonate form salt, water and carbon dioxide. Mixing water with common salt does not normally produce hydrogen gas.

Related tags

Acid-Metal-ReactionHydrogenSaltReactivityAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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