10HNO3+4Zn->4Zn(NO3)2+NH4NO3+3H2O Zn(0)-2e=Zn(+2)|4 N(+5)+8e=N(-3) | 1 MnO2+4HCl->MnCl2+Cl2+2H2O 2Cl(-)-2e=Cl2(0) |1 Mn(+4)+2e=Mn(+2) |1