Question

30. Solution of AI,(SO),; FeSO; Cuso, and ZnSO, were separately taken in
four test tubes and some iron filings were added in each of the test tubes.
After minutes a student would observe that the colour of:
(a) CuSO, solution only changed
(b) Solution of ZnSO, and Al(SO2), only changed
(C) Solution of CuSO,,ZnSO and Al,(SO.), changed and that of FeSO.
did not change.
(d) All the four solution changed.​

Answer 1

Answer: When an iron nail is dipped in copper sulphate solution, a brown coating of copper is formed on the surface of iron and the colour of copper sulphate solution changes from blue to light green.

Explanation: