117. Задачка по химии №011 718

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

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