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A student placed an iron nail in blue copper sulphate solution. The solution gradually turned green and a reddish-brown coating appeared on the nail. Which statement is correct?

Answer and explanation

Correct answer: It is a displacement reaction in which iron displaces copper from its salt.

Iron is above copper in the reactivity series, so it displaces copper from copper sulphate: Fe + CuSO₄ → FeSO₄ + Cu. The newly formed iron sulphate solution is pale green, while copper appears as the reddish-brown coating on the nail. Thus A correctly explains both observations. The reaction is not combination, decomposition by heating, or neutralisation because no acid-base reaction is involved.

Related tags

Displacement ReactionIronCopper SulphateReactivity SeriesChemical Reactions And EquationsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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