Question

To study the reaction between iron nails and copper sulphate solution​

Answer 1

Keep the control experiment to compare the colour of iron nails and copper sulphate solution.

• The brown coating on the iron nail shows that copper is deposited on the iron nail by displacing iron.
• The greenish colour of the solution in the test tube shows that Fe2+ ions are present in the solution.

Answer 2

It is called substitution reaction