Answer :
Final answer:
Zinc, when coated onto iron, prevents iron's corrosion through a process called galvanization. Even if the zinc layer is breached, the process of cathodic protection where zinc serves as a sacrificial anode can continue preventing iron from corroding.
Explanation:
The metal that, when coated onto iron, would prevent its corrosion is zinc (option A). This process is known as galvanization, where the iron is coated with a layer of zinc. The zinc layer, while intact, prevents air from contacting the iron and thereby prevents corrosion.
Notably, zinc is more readily oxidized, meaning even if the zinc layer is breached, the iron may still benefit from a cathodic protection process, where zinc serves as a sacrificial anode and corrodes in place of iron, further enhancing the durability of the iron against corrosion. Other metals like copper, in alloys like bronze and brass, can play this role too but are not specifically mentioned in your options.
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