O-LevelChemistryMetals & Reactivity5070/11 · Oct/Nov 2013 · Q281 Mark

Which diagram correctly illustrates 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 iron and copper in a beaker exposed to O₂ only.

BDiagram showing iron and magnesium in a beaker exposed to O₂ only.

CDiagram showing iron and copper in a beaker with O₂ + H₂O.

DDiagram showing iron and magnesium in a beaker with O₂ + H₂O.

✓ Correct answer

D: Diagram showing iron and magnesium in a beaker with O₂ + H₂O.

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Topic: Metals & Reactivity, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, Oct/Nov 2013 Paper 1 Variant 1, question 28.

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