Question

Why does colour of copper sulphate change from blue to green if an iron nail is placed in the solution of
copper sulphate ?Explain by writing the equation.
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Answer 1

Answer:

 It changes from blue to pale green because iron being more reactive than copper, displaces copper from it's aqueous salt solution. As a result colour of solution changes and copper gets deposited on iron nail

CuSO4 + Fe → FeSO4 + Cu

(Blue) (Green).

Answer 2

Explanation:

As the displacement reaction takes place where iron displaces copper from its Cooper sulphate solution.

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