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A metal gives gas with an acid but copper does not. What conclusion follows?

Answer and explanation

Correct answer: The first metal is more reactive than hydrogen, while copper is less reactive than hydrogen.

The relevant principle is the metal reactivity series. A metal above hydrogen can displace hydrogen from a dilute acid, producing hydrogen gas; for example, metal + acid can form a salt and H₂. Copper is below hydrogen in the usual school-level reactivity series and generally does not release hydrogen from dilute non-oxidising acids. Thus A follows. The gas is not always carbon dioxide, and the observation does not make copper highly reactive.

Related tags

Reactivity SeriesAcid MetalCopperAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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