(D) Galvanisation is the process of applying a protective $Zn$ coating to iron or steel to prevent rusting. Since $Zn$ is more reactive than $Fe$,it a

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(D) Galvanisation is the process of applying a protective $Zn$ coating to iron or steel to prevent rusting. Since $Zn$ is more reactive than $Fe$,it acts as a sacrificial anode and protects the iron even if the coating is scratched. Therefore,$Zn$ plating is the most durable method for protecting iron against corrosion.