May/June 2026 Paper 21

2026 · 40 questions · 40 parts · 40 marks

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27Metal Reactivity CorrosionMedium1 mark
Steel is an alloy of iron. Zinc is used to protect a steel car body from rusting. The steel body is completely coated in zinc. Which statements about this use of zinc are correct?
  1. 1
    The layer of zinc prevents oxygen reaching the steel to cause rust.
  2. 2
    Zinc is used because it is a more reactive metal than iron.
  3. 3
    If the zinc layer is scratched, the steel will rust.