Question

Why does the colour of an iron nail and copper sulphate solution changes its colour when dipped in it? Cu S O^4 + Fe -----------> Fe S O^4 + Copper

Answer 1

Explanation:

The colour of iron nail changes because the copper from CuSO4 gets deposited over it

Answer 2

Explanation:

When an iron nail immersed in the solution of copper sulphate than iron displaces copper from the solution of copper sulphate because iron is more reactive than copper. Therefore copper sulphate solution colour changes from blue to pale green.