On immersing an iron nail in CuSO4 solution for few minutes, you will observe that
(a) no reaction takes place
(b) the colour of solution fades away
(c) the surface of iron nails acquire a black coating
(d) the colour of solution changes to green.

Correct Answer: (b) the colour of solution fades away

Explanation: Fe(s) + CuSO₄ (aq) → FeSO₄ (aq) + Cu(s)

Fe is present above in the reactivity series of metals. Hence, Fe displaces Cu from CuSO₄ solution. And the colour of the solution fades away. This is an example of a displacement reaction.

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Updated on: 14-Mar-2023

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