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: [[Iron (II) Oxide]] has a [[Giant Ionic Structure|giant ionic structure]].
: [[Iron (II) Oxide]] [[Chemical Reaction|reacts]] with [[acid]]s to produce a [[Iron]] [[salt]] and [[water]].
:: [[Hydrochloric Acid]] + [[Iron (II) Oxide]] → [[Iron (II) Chloride]] + [[Water]]
:: 2HCl + FeO → 2FeCl<sub>2</sub> + H<sub>2</sub>O
:: [[Sulphuric Acid]] + [[Iron (II) Oxide]] → [[Iron (II) Sulphate]] + [[Water]]
:: H<sub>2</sub>SO<sub>4</sub> + FeO → FeSO<sub>4</sub> + H<sub>2</sub>O
:: [[Nitric Acid]] + [[Iron (II) Oxide]] → [[Iron (II) Nitrate]] + [[Water]]
:: 2HNO<sub>3</sub> + FeO → Fe(NO<sub>3</sub>)<sub>2</sub> + H<sub>2</sub>O