S2VIIO82- + (MnII)2+ + 4 OH- MnIVO2 + 2 SVIO42- + 2 H2O

This is an oxidation-reduction (redox) reaction:

MnII - 2 e- MnIV (oxidation)

2 SVII + 2 e- 2 SVI (reduction)

Change the oxidation states