Question

why does the colour of copper sulphate solution change when an iron nail is depped in it ​

Answer 1

Explanation:

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 (aq) + Fe (s) gives FeSO4 (aq) + Cu (s)

Answer 2

Answer:

The colour of copper sulphate solution changes when iron nails is dipped into it because iron nails are more reactive then copper. So iron displaces copper from copper sulphate solution.

Explanation:

CuSO4+Fe=FeSO4+Cu