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When an iron nail is placed in a blue copper sulphate solution, which observation identifies that a displacement reaction has occurred?

Answer and explanation

Correct answer: A reddish-brown copper coating forms on the iron nail and the blue solution gradually turns green

The reactivity series places iron above copper, so iron displaces copper from copper sulphate: Fe + CuSO₄ → FeSO₄ + Cu. Reddish-brown copper deposits on the nail, while pale green FeSO₄ forms in solution and reduces the blue colour. Thus A is correct. Silver deposition, no reaction, or rapid gas bubbles do not describe this displacement reaction.

Related tags

ScienceClass10Displacement-ReactionReactivity-SeriesCopper-SulphateChemical Reactions And EquationsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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