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Chemistry · Oct / Nov 2023 · Paper 11 · Question 28

5070Corrosion of metals

Which statement about corrosion of metals is correct?

  1. AA barrier method is needed to prevent the corrosion of stainless steel.
  2. BIron corrodes to produce hydrated iron(I) oxide.
  3. CSacrificial protection uses a less reactive metal attached to the metal object that is being protected.
  4. DWhen corrosion occurs, the metal loses electrons to become positive ions.

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Correct answer: D. When corrosion occurs, the metal loses electrons to become positive ions.

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