11. Why can sulfurous acid exhibit both oxidizing and reducing properties? Based on the electronic equations, arrange the coefficients in the equations of the reactions that follow the schemes:
MnS HNO3 → Mn(NO3)2 H2SO4 NO H2O
H2O2 As2O3 NaOH → Na3AsO4 H2O
FeCl3 H2SO3 H2O → FeCl2 H2SO4 HCl

If you do not open the file - install the RAR archiver. Inside the archive you will find a solution in Word format.