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Why is hydrogen gas generally not evolved when dilute hydrochloric acid is added to copper?

Answer and explanation

Correct answer: Copper is less reactive than hydrogen

The governing concept is the metal reactivity series. A metal releases hydrogen from a dilute non-oxidising acid only when it is above hydrogen in the series and can displace H⁺ ions. Copper lies below hydrogen, so it does not normally react with dilute hydrochloric acid to produce H₂. It does not dissolve simply in water, hydrochloric acid is an acid, and the statement that copper always forms gas is false. Thus option A is correct.

Related tags

Reactivity SeriesCopperHydrochloric AcidAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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