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The most durable metal plating on iron to protect against corrosion is

1. Nickel plating
2. Tin plating
3. Copper plating
4. Zinc plating

Correct answer: Zinc plating

Solution

Zinc plating (galvanization) is the most durable method to protect iron from corrosion because zinc acts as a sacrificial anode, preventing rust formation even if the coating is scratched.

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