, ? , .
.
- , . , ( 1), . . ( 2) (0) . - . ,
H2O2 + 2H+ + 2 = 2H2O,
H2O2 , 1,776 , , (0,682 )
O2 + 2H+ + 2 = H2O2,
.
, , :
H2O21 + Pb+4O2 + 2HNO3 = Pb+2(NO3)2 + O + 2H2O,
O - 2 = O ,
Pb+4 + 2 = Pb+2 ,
PbS2 + 4H2O21 = PbS+6O4 + 4H2O2,
S2 - 8 = S+6 ,
O + 2 = 2O2 .