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The application of a zinc layer to an iron surface, known as galvanization, helps preserve the sheen of galvanized iron sheets due to the creation of a protective layer of basic zinc carbonate. What explains this phenomenon?

1. This occurs because zinc possesses a greater oxidation potential compared to Ni, Cu, and Sn.
2. This occurs because zinc possesses a lesser oxidation potential compared to Ni, Cu, and Sn.
3. This occurs because zinc possesses a greater reduction potential compared to Ni, Cu, and Sn.
4. This occurs because zinc possesses a lesser reduction potential compared to Ni, Cu, and Sn.

Correct answer: This occurs because zinc possesses a greater oxidation potential compared to Ni, Cu, and Sn.

Solution

Zinc protects iron by acting as a sacrificial anode due to its higher oxidation potential compared to Ni, Cu, and Sn, allowing it to corrode preferentially.

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