Fe-FeCl2-FeCl3-Fe(OH)3-Fe2O3

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This progression of iron compounds represents a series of reactions that often occur when iron metal is exposed to air and water.

Iron metal (Fe) reacts with chlorine gas (Cl2) to form iron(II) chloride (FeCl2).

Iron(II) chloride can further react with chlorine gas to form iron(III) chloride (FeCl3).

Iron(III) chloride can then react with water (H2O) to form iron(III) hydroxide (Fe(OH)3), a basic compound.

Iron(III) hydroxide can gradually dehydrate and oxidize to form iron(III) oxide (Fe2O3), also known as rust.

Overall, this series of reactions demonstrates the tendency of iron to undergo oxidation in the presence of oxygen and water, ultimately leading to the formation of iron oxide, commonly known as rust.