4Fe(OH)2+O2+2H2O=4Fe(OH)3 ```铁从2价变3价``氧升2价
2KmnO4=K2mnO4+MNO2+O2 ````锰从7价变6价和4价```氧有两个原子变0价
H2S+3H2SO4=4SO2+4H2O ````硫价态归中``一个原子升6价,3个原子降2价 都变4价
4Fe(OH)2+O2+2H2O=4Fe(OH)3 ```铁从2价变3价``氧升2价
2KmnO4=K2mnO4+MNO2+O2 ````锰从7价变6价和4价```氧有两个原子变0价
H2S+3H2SO4=4SO2+4H2O ````硫价态归中``一个原子升6价,3个原子降2价 都变4价