2 K2CrXIIO7 + 9 Na2SIVO3 + 5 H2SVIO4 Cr2III(SVIO4)3 + 2 K2SVIO4 + 9 Na2SVIO4 + 5 H2O

This is an acid-base reaction (neutralization): Na2SO3 is a base, H2SO4 is an acid.

This is an oxidation-reduction (redox) reaction:

9 SIV - 18 e- 9 SVI (oxidation)

2 CrXII + 18 e- 2 CrIII (reduction)

Na2SO3 is a reducing agent, K2CrO7 is an oxidizing agent.

Warning: Unknown compound 'K2CrO7'