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A solution turns blue litmus red but does not release hydrogen when copper metal is added. What should be understood?

Answer and explanation

Correct answer: The solution may be acidic but copper is less reactive

Blue litmus turning red is a standard indication that the solution is acidic. However, hydrogen evolution depends on the reactivity of the metal as well as the acid. Metals above hydrogen in the reactivity series can usually displace hydrogen from dilute acids, whereas copper is below hydrogen and generally does not do so. Therefore option A correctly combines both observations; B and D contradict the litmus test, and C is chemically false.

Related tags

CopperAcidReactivity SeriesAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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