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To make iron go rusty, one substance from the list below is needed: water.
Here's why water is essential for iron to rust:
1. Rusting is an oxidation reaction that occurs when iron reacts with oxygen in the presence of water or moisture.
2. Water acts as an electrolyte, facilitating the flow of electrons between iron and oxygen, which accelerates the rusting process.
3. Without water, iron would not rust, as the presence of moisture is crucial for the formation of rust.
Therefore, out of the substances listed, water is the key component needed for iron to go rusty.
