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A dilute acid gives gas with a metal, but the same acid generally gives no gas with copper. What is the main reason?

Answer and explanation

Correct answer: Copper is less reactive than hydrogen

The governing idea is the reactivity series. A metal placed above hydrogen can displace hydrogen from a dilute acid, producing hydrogen gas, for example Zn + 2HCl → ZnCl₂ + H₂. Copper lies below hydrogen, so it generally cannot displace hydrogen from dilute hydrochloric or dilute sulphuric acid. Thus option A is correct; the other statements are chemically unrelated or false.

Related tags

Reactivity SeriesCopperAcid ReactionMetals And Non MetalsScienceClass 10 Mcq

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