Ответ:

Hg+HCl=HgCl2+H2

K+H2O=2KOH+H2

Fe+H2SO4=FeSO4+H2

Cu+Cl2=CuCl2

Zn+H2O=ZnO+H2

Ba+CuSo4(p-p)=BaSO4

Fe+Hg(NO3)2=Fe(NO3)3

Cu+O2=CuO2

Ag+H2SO(p)=Ag2SO4+2H2O+SO2

Mg+S=MgS