Chemistry · Metals and Non-metals
Why does a galvanised iron article remain protected from rusting even if the zinc coating is scratched?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1Zinc is more reactive than iron and undergoes preferential oxidation, protecting the iron.✓
- 2Iron forms a thin layer of rust that prevents further corrosion.
- 3Scratches allow oil to seep in and prevent rusting.
- 4Zinc reacts with iron to form a protective layer of iron oxide.
Correct answer
Zinc is more reactive than iron and undergoes preferential oxidation, protecting the iron.
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