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Why does copper generally not produce hydrogen gas with dilute hydrochloric acid?

Answer and explanation

Correct answer: Because copper is less reactive than hydrogen

The governing concept is the reactivity series. A metal can displace hydrogen from a dilute non-oxidising acid only when it is more reactive than hydrogen. Copper lies below hydrogen in the series, so it cannot normally reduce hydrogen ions from dilute hydrochloric acid to H₂. Option B is false because copper does not simply dissolve in water; option C misidentifies HCl, and option D is an unjustified absolute statement. Hence A is correct.

Related tags

Reactivity-SeriesCopperHydrochloric-AcidHydrogenClass10AcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And Behaviour

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