a) C + 2H2SO4--->CO2 + 2SO2 + 2H2O
C(0) - 4e ---->C(+IV)..................C-------reduktor
2S(+VI) + 4e ---->2S(+IV)...........H2SO4---utleniacz
b) 2KMnO4 + 10KBr + 8H2SO4--->2MnSO4 + 6K2SO4 + 5Br2 + 8H2O
2Mn(+VII) + 10e ---->2Mn(+II).............KMnO4----utleniacz
10Br(-) - 10e ---->5Br2(0).................KBr---------reduktor
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a) C + 2H2SO4--->CO2 + 2SO2 + 2H2O
C(0) - 4e ---->C(+IV)..................C-------reduktor
2S(+VI) + 4e ---->2S(+IV)...........H2SO4---utleniacz
b) 2KMnO4 + 10KBr + 8H2SO4--->2MnSO4 + 6K2SO4 + 5Br2 + 8H2O
2Mn(+VII) + 10e ---->2Mn(+II).............KMnO4----utleniacz
10Br(-) - 10e ---->5Br2(0).................KBr---------reduktor