Question

Why the colour of blue copper sulphate solution becomes light green when iron power is added to it? ​

Answer 1

Answer:

Iron nail acquires a brown coating of copper as a result of the displacement reaction in which iron has displaced copper from copper sulphate solution. Actually iron is placed above copper in the reactivity series. The solution becomes light green.

Fe(s)+CuSO4(aq)→(Iron nail)FeSO4(aq)+Cu(s) (deposited on nail)