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GALVANISATION protects iron from rusting by coating it with:
ATin (Sn), which is less reactive than the iron underneath
BCopper (Cu), which is more noble metal than the iron beneath
CZinc (Zn), the more reactive metal as sacrificial anode
DGold (Au), which never tarnishes in normal atmospheric air
Answer & Solution
Correct answer: C. Zinc (Zn), the more reactive metal as sacrificial anode
GALVANISATION = coating iron with ZINC. Zn is more reactive than Fe (more negative E°), so Zn oxidises preferentially, sacrificing itself to protect the iron underneath. Even if the coat is scratched, Zn still corrodes first (cathodic protection).
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