O-LevelChemistryMetals & Reactivity5070/11 · May/June 2023 · Q281 Mark

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.

A1 and 2 only

B1 and 3 only

C2 and 3 only

D1, 2 and 3

✓ Correct answer

A: 1 and 2 only

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Topic: Metals & Reactivity, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, May/June 2023 Paper 1 Variant 1, question 28.

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