2 FeIICl2 + H2O2-I + 2 HCl → 2 FeIIICl3 + 2 H2O-II

This is an oxidation-reduction (redox) reaction:

2 FeII - 2 e- → 2 FeIII (oxidation)

2 O-I + 2 e- → 2 O-II (reduction)

Change the oxidation states

Search by reactants (FeCl2, H2O2, HCl)

1.H2O2 + FeCl2 + HCl → FeCl3 + H2O
2.H2O2 + FeCl2 + HCl → FeCl3 + O2 + H2O
3.H2O2 + FeCl2 + HCl → Fe + H2 + FeCl3 + O2
4.H2O2 + FeCl2 + HCl → Fe + FeCl3 + H2O
5.H2O2 + FeCl2 + HCl → H2 + FeCl3 + H2O

Search by products (FeCl3, H2O)

1.H2O2 + FeCl2 + HCl → FeCl3 + H2O
2.Fe2O3 + HCl → FeCl3 + H2O
3.FeCl2 + K2Cr2O7 + HCl → CrCl3 + FeCl3 + KCl + H2O
4.Fe(OH)3 + HCl → FeCl3 + H2O
5.FeCl2 + KMnO4 + HCl → MnCl2 + FeCl3 + KCl + H2O
6.FeCl2 + KMnO4 + HCl → MnCl2 + FeCl3 + KCl + Cl2 + H2O
7.FeCl2 + KClO3 + HCl → FeCl3 + KCl + H2O
8.FeCl2 + HNO3 + HCl → FeCl3 + NO + H2O
9.FeCl2 + HNO2 + H2SO4 → FeCl3 + N2 + Fe2(SO4)3 + H2O
10.FeS2 + HNO3 + HCl → FeCl3 + NO + H2SO4 + H2O

Search by reactants (FeCl2, H2O2, HCl) and by products (FeCl3, H2O)

1.H2O2 + FeCl2 + HCl → FeCl3 + H2O
2.H2O2 + FeCl2 + HCl → FeCl3 + O2 + H2O
3.H2O2 + FeCl2 + HCl → Fe + FeCl3 + H2O
4.H2O2 + FeCl2 + HCl → H2 + FeCl3 + H2O