3 MnO2 + CaCl2 + 4 H3PO4 → 2 Cl + Mn3(PO4)2 + Ca(PO4)2 + 6 H2O
This is an oxidation-reduction (redox) reaction:
2 PV - 4 e- → 2 PVII (oxidation)
3 MnIV + 6 e- → 3 MnII (reduction)
2 Cl-I - 2 e- → 2 Cl0 (oxidation)
H3PO4 is a reducing agent, MnO2 is an oxidizing agent, CaCl2 is a reducing agent.
Warning: Unknown compound 'Cl'