Question

Explain the following process/events.



1) put two to three iron nails in the blue solution of copper sulphate and after 15 to 20 minutes the colour of the solution turns green​

Answer 1

Fe(s)+CuSO 4 ⟶Cu(s)+FeSO 4

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. This reaction shows that iron is more reactive than copper as it displaces copper from its solution and iron passes into solution as

Fe 2+ions and ferrous sulphate solution is formed.