O-LevelChemistryMetals & Reactivity5070/12 · Oct/Nov 2021 · Q331 Mark

Which statements about the corrosion of iron are correct? 1 Corrosion can be prevented by coating the iron with zinc. 2 Corrosion only occurs in the presence of both air and water. 3 Rust is an alloy of iron and oxygen. 4 Sacrificial protection occurs when iron is connected to a less reactive metal.

A1 and 2

B1 and 3

C2 and 4

D3 and 4

✓ Correct answer

A: 1 and 2

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Topic: Metals & Reactivity, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, Oct/Nov 2021 Paper 1 Variant 2, question 33.

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