Mild steel is galvanised so that corrosion of the iron is prevented. Which of these statements about galvanising are correct? 1. Galvanising prevents corrosion because the zinc makes an alloy. 2. If the coating is damaged, water and oxygen still do not corrode the iron. 3. Zinc is a sacrificial metal and corrodes instead of iron.
- A1 and 2
- B1 and 3
- C2 only
- D2 and 3