Chemistry · May / June 2023 · Paper 11 · Question 28

Zinc is used to galvanise iron, which prevents the iron from rusting. Which statements are correct? 1 The layer of zinc forms a barrier between the iron and the oxygen and water in the atmosphere. 2 Zinc will oxidise before the iron does, even if the layer of zinc is scratched. 3 When iron rusts, atoms of iron gain electrons to form ions.

1. A1 and 2 only
2. B1 and 3 only
3. C2 and 3 only
4. D1, 2 and 3

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