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Why is the gas formed by adding a metal to an acid not obtained with every metal?

Answer and explanation

Correct answer: Metals have different reactivities

The governing concept is the reactivity of metals with dilute acids. A metal above hydrogen in the reactivity series can generally displace hydrogen from an acid, producing hydrogen gas; for example, magnesium reacts with hydrochloric acid. Metals below hydrogen, such as copper, usually do not release hydrogen in this way. Thus option A is correct. Options B, C, and D are false because metals differ in reactivity, colour is irrelevant, and some metals do react with acids.

Related tags

Reactivity SeriesMetal Acid ReactionHydrogen GasAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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