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The chemical reactions shown are:Iron (Fe) reacts with oxygen (O₂) to form iron (III) oxide (Fe₂O₃).Iron (III) oxide reacts with hydrochloric acid (HCl) to form iron (III) chloride (FeCl₃).Iron (III) chloride reacts with sodium phosphate (Na₃PO₄) to form iron (III) phosphate (FePO₄).
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