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A clean iron nail is placed in blue copper sulphate solution. A reddish-brown coating forms and the solution turns light green. Which conclusion is correct?

Answer and explanation

Correct answer: Iron displaces copper from its salt because iron is more reactive than copper.

The reactivity series shows that iron is more reactive than copper. Therefore iron displaces copper from copper sulphate according to Fe + CuSO₄ → FeSO₄ + Cu. Ferrous sulphate gives the solution a light green colour, and copper forms the reddish-brown coating. Hence B is correct. A reverses the reactivity relationship, while C and D ignore the formation of new substances.

Related tags

Iron DisplacementCopper SulphateReactivity SeriesChemical EquationChemical Reactions And EquationsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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