O-LevelChemistryMetals & Reactivity5070/11 · May/June 2020 · Q291 Mark

Which diagram correctly shows the conditions necessary for the rusting of iron and also the metal that can be used to prevent rusting by sacrificial protection?

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Adiagram showing an iron block covered with copper, submerged in O₂ only.

Bdiagram showing an iron block covered with magnesium, submerged in O₂ only.

Cdiagram showing an iron block covered with copper, submerged in O₂ + H₂O.

Ddiagram showing an iron block covered with magnesium, submerged in O₂ + H₂O.

✓ Correct answer

D: diagram showing an iron block covered with magnesium, submerged in O₂ + H₂O.

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Topic: Metals & Reactivity, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, May/June 2020 Paper 1 Variant 1, question 29.

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