1)2HNO3+ZnSO4=Zn(NO3)2+SO3+H2O
2H+2NO3+Zn+SO4=Zn+2NO3+SO3+H2O
2H+SO4=SO3+H2O
2)Pb(NO3)2+K2S=PbS(осадок)+2KNO3
Pb+2NO3+2K+S=PbS+2K+2NO3
Pb+S=PbS
1)2HNO3+ZnSO4=Zn(NO3)2+SO3+H2O
2H+2NO3+Zn+SO4=Zn+2NO3+SO3+H2O
2H+SO4=SO3+H2O
2)Pb(NO3)2+K2S=PbS(осадок)+2KNO3
Pb+2NO3+2K+S=PbS+2K+2NO3
Pb+S=PbS