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Which metal is least likely to produce hydrogen gas with dilute acid?

Answer and explanation

Correct answer: Copper

A metal generally displaces hydrogen from a dilute non-oxidising acid only when it is above hydrogen in the reactivity series. Magnesium, zinc, and iron are above hydrogen and can release hydrogen under suitable conditions. Copper is below hydrogen, so it does not normally displace hydrogen from dilute hydrochloric or dilute sulphuric acid. Therefore copper is the least likely, making option A correct.

Related tags

Reactivity SeriesCopperAcid MetalHydrogenChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScienceClass 10 Mcq

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