Question

Fe>Fe2O3> >Fe(OH)3>Fe(NO3)3

Answer 1

4Fe + 3O2 → 2Fe2O3  
Fe2O3+6NaOH → 2Fe(OH)3 + 3Na2O 
Fe(OH)3 + 3HNO3 → Fe(NO3)3 + 3H2O

Answer 2

4Fe + 3O₂(изб.) = 2Fe₂O₃

Fe₂O₃ + 6HCl = 2FeCl₃ + 3H₂O
FeCl₃ + 3NaOH = Fe(OH)₃↓ + 3NaCl

Fe(OH)₃ + 3HNO₃ = Fe(NO₃)₃ + 3H₂O