O LevelChemistryCambridgeExam Questions9. Metals9.5 Corrosion of Metals

Corrosion of Metals (Cambridge O Level Chemistry)

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9.5 Corrosion of Metals

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9.5 Corrosion of Metals

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11 mark

The diagrams below show some of the uses of iron.

In which of these uses is iron most likely to rust?

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    21 mark

    A student prepared four iron nails as explained below in an experiment to investigate rusting. She allowed the nails to rest in individual test tubes in a laboratory for one week.

    Which nail will show the greatest amount of rust?

    • Dipped in water and allowed to dry.

    • Dipped in paint and allowed to dry.

    • Coated in grease.

    • Galvanised with zinc.

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    31 mark

    The diagram shows the experimental set-up a student used to investigate the composition of air. The student left the apparatus in the laboratory and observed that the water level had risen inside the test tube after one week.

    q3-9-2-easy-cie-igcse-chemistry

    Which statement explains why the water level rose?

    • Nitrogen monoxide was produced.

    • Iron oxide was produced.

    • The temperature of the water increased.

    • Sulfur dioxide was produced.

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    11 mark

    Brass is an alloy of two metals.

    Which row describes the correct use of the two metals that brass is made from?

      metal 1 metal 2
    A galvanising steel making aircraft
    B electrical wiring galvanising steel
    C making aircraft making cutlery
    D making cooking pans electrical wiring

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      21 mark

      Attaching pieces of magnesium to underground iron pipes can protect the iron from corrosion.

      Which reaction protects the iron from corrosion?

      • Fe2+(aq) + 2e– → Fe(s)

      • Fe(s) → Fe2+(aq) + 2e–

      • Mg2+(aq) + 2e–  → Mg(s)

      • Mg(s) → Mg2+(aq) + 2e–

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      11 mark

      Small blocks of zinc are attached to ship hulls which are commonly made from steel, an alloy of iron. This is done to prevent the hull from rusting.

      Which statement explains this process?

      • Zinc is higher up on the reactivity series than iron so has a higher tendency to become reduced.

      • Zinc is lower down on the reactivity series than iron so has a higher tendency to become reduced.

      • Zinc is higher up on the reactivity series than iron so has a higher tendency to become oxidised.

      • Zinc is lower down on the reactivity series than iron so has a higher tendency to become oxidised.

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