Single Answer MCQ
Q-00019693
If zinc coating on iron is scratched, why does it still protect against rusting?
1
Zinc is more reactive than iron
2
Iron cannot corrode
3
Zinc re-melts to cover the scratch
4
Zinc prevents oxygen from reaching iron
Answer and Solution
Answer
A. Zinc is more reactive than iron
Solution:
Zinc is more reactive than iron, so it will oxidize preferentially, protecting the iron even if the coating is scratched. Other options do not accurately describe the nature of protection.
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