O-LevelChemistryMetals & Reactivity5070/11 · May/June 2021 · Q321 Mark

Attaching pieces of magnesium to underground iron pipes can protect the iron from corrosion. Which reaction protects the iron from corrosion?

AFe²⁺(aq) + 2e⁻ → Fe(s)

BFe(s) → Fe²⁺(aq) + 2e⁻

CMg²⁺(aq) + 2e⁻ → Mg(s)

DMg(s) → Mg²⁺(aq) + 2e⁻

✓ Correct answer

D: Mg(s) → Mg²⁺(aq) + 2e⁻

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Topic: Metals & Reactivity, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, May/June 2021 Paper 1 Variant 1, question 32.

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