Zinc is used to galvanise iron, which stops the iron from rusting. Which of these statements are correct? 1 The zinc layer acts as a barrier separating the iron from oxygen and water in the air. 2 Zinc oxidises before the iron does, even if the zinc layer is scratched. 3 When iron rusts, iron atoms gain electrons and form ions.
- A1 and 2 only
- B1 and 3 only
- C2 and 3 only
- D1, 2 and 3