CO+MnO2=MnCO (C+2-2e=C+4, Mn+4+2e=Mn+2) уравнивать не нужно.
4KCLO3=KCL+3KCLO43 (Cl+5-2e=Cl+7 |*3, Cl+5+6e=Cl-1)
PH3+2O2=H3PO4 (P-3-8e=P+5, O0+4e=2O-2 |*2)
2KmnO4+3H2O2=2MnO2(т)+3O2+2H2O+2KOH (Mn+7-3e=Mn+4 |*2, 2O-1+2e=O0 |*3) Br2(p) + SO2(г) + 2H2O = 2HBr + H2SO4 (Br0+2e=2Br-1, S+4-2e=S+6)
2Al(т) + 2NaOH +6H2O = 2Na[Al(OH)4] + 3H2(г) (Al0-3e=Al+3 |*2, 2H+1-2e=H0 |*3)
Сr3+ CO2(г) + H2O = Cr2O72– + H3O+ + H2C2O4