Take a clean wire of copper and an iron nail.
Put the copper wire in a solution of iron sulphate and the iron nail in a solution of copper sulphate taken in test tubes (Fig. 3.4).
✅ Answer: After 20 minutes, it is observed that blue CuSO4 solution turns green.
In which test tube did you find that a reaction has occurred?
✅ Answer: Test tube containing CuSO4 solution.
On what basis can you say that a reaction has actually taken place?
✅ Answer: The blue colour of CuSO4 starts fading.
Can you correlate your observations for the Activities 3.9, 3.10 and 3.11?
✅ Answer: Yes. In those activities, it is found that Iron is more reactive than copper. It displaces Cu from CuSO4 to form FeSO4.
Write a balanced chemical equation for the reaction that has taken place.
✅ Answer: Fe(s) + CuSO4(aq) → FeSO4(aq) + Cu(s)
Name the type of reaction.
✅ Answer: This is a displacement reaction. i.e., reactive metals displace less reactive metals from their compounds in solution or molten form.