The chemical reactions described in the sequence are as follows:

Fe2O3 (iron(III) oxide) -> Fe2(SO4)3 (iron(III) sulfate): Reacting iron(III) oxide with sulfuric acid (H2SO4) produces iron(III) sulfate.

Fe2(SO4)3 -> Fe(OH)3 (iron(III) hydroxide): Adding sodium hydroxide (NaOH) to iron(III) sulfate forms iron(III) hydroxide.

Fe(OH)3 -> H2O (water): Iron(III) hydroxide can further react with acid or base to form water.

H2O -> NaOH (sodium hydroxide): Water can be electrolyzed to produce sodium hydroxide.

NaOH -> NaCl (sodium chloride): Sodium hydroxide can react with hydrochloric acid (HCl) to form sodium chloride.