Chemistry · Oct / Nov 2016 · Paper 11 · Question 28
Attaching pieces of magnesium to underground iron pipes can protect the iron from corrosion. Which reaction protects the iron from corrosion?
- AFe2+(aq) + 2e– → Fe(s)
- BFe(s) → Fe2+(aq) + 2e–
- CMg2+(aq) + 2e– → Mg(s)
- DMg(s) → Mg2+(aq) + 2e–
As printed in the paper
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Correct answer: D. Mg(s) → Mg2+(aq) + 2e–
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