Question

The diagrams below represent two iron nails with some parts covered tightly with zinc and tin respectively. What observations would be made at the exposed points R and Z if the wrapped nails are left in the open for several days? Explain.

Answer 1

1. At R: No rusting occurred. Zinc is more reactive than iron hence it reacts with moist air instead of iron.
2. At Z: Rusting occurred. Tin is less reactive than iron hence iron reacts with moist air to form rust.