2 HIICl2 + 2 Fe0 H20 + 2 FeIICl2

This is an oxidation-reduction (redox) reaction:

2 HII + 4 e- 2 H0 (reduction)

2 Fe0 - 4 e- 2 FeII (oxidation)

HCl2 is an oxidizing agent, Fe is a reducing agent.