8 H2O + 2 Mn0 + 7 K2S2VIIO8 8 H2SVIO4 + 6 K2SVIO4 + 2 KMnVIIO4

This is an oxidation-reduction (redox) reaction:

2 Mn0 - 14 e- 2 MnVII (oxidation)

14 SVII + 14 e- 14 SVI (reduction)

Change the oxidation states