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Magnesium gives brisk bubbles with an acid, but copper does not. What is the reason?

Answer and explanation

Correct answer: Magnesium is more reactive than copper

The governing concept is the reactivity series of metals. Metals above hydrogen can generally displace hydrogen from dilute acids. Magnesium is above hydrogen and reacts to form a magnesium salt and hydrogen gas, producing brisk bubbles: Mg + 2HCl → MgCl₂ + H₂. Copper is below hydrogen, so it does not normally liberate hydrogen from dilute non-oxidising acids. Therefore option A is correct; the other statements are chemically false.

Related tags

Reactivity SeriesMagnesiumCopperAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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