Степень окисления S+H2SO4==>SO2+H2O KY+KYO3+H2SO4==>Y2+K2SO4+H2 NaCrO2+Br+NaOH==>Na2CrO4+NaBr+H2O KMnO4+KY+H2SO4==>MnSO4+Y2+K2SO4+H2O Cl2+KOH==>KCL==>KLC+KClO3+H2O
S (0)---->(+4),S (+6)--->S (+4) Y (-1)--->Y (0),H (+1)--->H (0) Br (0)--->Br (-1) ,Cr (+3)--->Cr (+6) Mn (+7)--->Mn(+2),Y (-1)--->Y (0) Cl (0)--->Cl (-1),Cl (-1)--->Cl (+5)