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Hydrogen Helium Nitrogen Oxygen Magnesium Aluminium copper(II) oxide diphosphorus pentoxide iron(II) oxide iron(III) oxide hydrochloric acid hydrosulfuric acid nitric acid sulfuric acid barium hydroxide iron(III) hydroxide Silver chloride Sodium chlorite silver nitrate sodium hydrogen sulfite potassium chlorate ammonium hydrogen p hosphate potassium dichromate calcium dihydrogen phosphate.