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Why does a green solution form when an iron nail is placed in copper sulphate solution?

Answer and explanation

Correct answer: Iron(II) sulphate is formed

Iron is more reactive than copper, so it displaces copper from copper sulphate solution: Fe + CuSO₄ → FeSO₄ + Cu. The deposited copper appears reddish brown, while aqueous iron(II) sulphate is pale green, causing the solution to become greenish. Sodium chloride, barium sulphate, and magnesium oxide contain elements not involved in this reaction, so they cannot explain the observation.

Related tags

ScienceClass10Displacement ReactionIron SulphateCopper SulphateChemical Reactions And EquationsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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