Помогите решить
Fe2O3 ⇒ Fe
Fe ⇒ FeCl3
Fe ⇒ Fe3O4
Fe ⇒ FeCl2
FeCl2 ⇒ Fe(OH)2
FeCl3 ⇒ Fe(OH)3
Fe(OH)3 ⇒ Fe(NO3)3
Fe(NO3)3 ⇒ Fe
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