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To safeguard the underside of a ship, a more reactive metal such as magnesium is attached to the iron. This method is referred to as cathodic protection.

1. Magnesium is chosen because it has a greater tendency to oxidize compared to iron.
2. Magnesium is chosen because it has a lesser tendency to oxidize compared to iron.
3. Magnesium is chosen because it has a greater tendency to undergo reduction compared to iron.
4. Magnesium is chosen because it has a lesser tendency to undergo reduction compared to iron.

Correct answer: Magnesium is chosen because it has a greater tendency to oxidize compared to iron.

Solution

Magnesium is more reactive than iron because it has a higher oxidation potential, meaning it oxidizes more readily, protecting the iron by acting as a sacrificial anode.

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