Question

A clean uron nail was place in a test tube containing copper sulphate
solution After 2-3 days it was observed that the colour of the solution
changed from blue to green
0
(0)
Why did the colour of the solution change?
​

Answer 1

Answer:

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.

The reaction is

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