When iron corrodes, it converts from which form?

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Multiple Choice

When iron corrodes, it converts from which form?

Explanation:
Corrosion is an oxidation process. When iron corrodes, its atoms lose electrons and form ions in solution. The first oxidation product is ferrous ion, Fe2+. So iron converts from metallic iron (Fe0) to Fe2+ as the initial step. In the presence of oxygen and water, those Fe2+ ions can further oxidize to Fe3+ and eventually form the ferric oxides/hydroxides that we see as rust. The other possibilities would involve different steps (directly to Fe3+ or reduction), which aren’t the initial change that starts corrosion.

Corrosion is an oxidation process. When iron corrodes, its atoms lose electrons and form ions in solution. The first oxidation product is ferrous ion, Fe2+. So iron converts from metallic iron (Fe0) to Fe2+ as the initial step. In the presence of oxygen and water, those Fe2+ ions can further oxidize to Fe3+ and eventually form the ferric oxides/hydroxides that we see as rust. The other possibilities would involve different steps (directly to Fe3+ or reduction), which aren’t the initial change that starts corrosion.

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