Fe-FeCl2-FeOH2-FeSO4-FeCl3-FeOH3-FeSO4

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Iron exists in several oxidation states, represented by Fe(II) and Fe(III) in the compounds FeCl2 and FeCl3 respectively.

FeCl2, also known as iron(II) chloride, is a greenish-yellow solid that is soluble in water. FeCl3, or iron(III) chloride, is a brownish-red solid that is also soluble in water.

FeOH2 is iron(II) hydroxide, a greenish solid that is sparingly soluble in water. FeOH3 is iron(III) hydroxide, a reddish-brown solid that is insoluble in water.

FeSO4 is iron(II) sulfate, a white solid that is soluble in water. Fe2(SO4)3 is iron(III) sulfate, a yellowish solid that is also soluble in water.

In summary, the compounds listed in the sequence Fe-FeCl2-FeOH2-FeSO4-FeCl3-FeOH3-FeSO4 represent different oxidation states of iron and its corresponding compounds.