Question

4. Why do you observe a change in colour of the solution of copper sulphate when an iron nail is dropped in it? Why
does the shining iron nail become dull?​

Answer 1

Explanation:

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

Answer 2

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.