Question

Fe = FeCI2 = Fe (OH)2 = Fe (OH)3 = Fe(NO3)3

Answer 1

Fe + 2HCl -> FeCl2 + H2
FeCl2 + 2NaOH -> Fe(OH)2 + 2NaCl
4Fe(OH)2 + O2 +2H2O> 4Fe(OH)3
Fe(OH)3 + 3HNO3 -> Fe(NO3)3 + 3H2O