Question

4. What changes in the colour of iron nails and copper sulphate solution do you
observe after keeping the iron nails dipped in copper sulphate solution for about 30 minutes​

Answer 1

Answer:

When an iron nail is dipped in copper sulphate solution, a brown coating of copper is formed in the surface of iron and the colour of copper sulphate solution changes from blue to pale green. The reaction shows that iron is more reactive than copper because it displaces copper from the copper sulphate solution.

Answer 2

Answer:

iron nail becomes brownish in colour and the blue colour of copper sulphate solution fade.

Explanation:

because iron is more reactive than copper