a)Hg+Hg(NO3)2=2HgNO3 (Hg2(NO3)2)
2HgNO3=HgO+NO2↑
HgO+2Cl2=HgCl2+Cl2O
HgCl2+Hg=Hg2Cl2
Hg2Cl2+H2SO4(k)=HgCl2+HgSO4+SO2++2H2O
Hg{+} - e- =Hg{2+} |2
S{6+} +2e- =S{4+} |1
б) 4HNO3+2Hg=Hg2(NO3)2+2NO2+2H2O
Hg2(NO3)2+2NaOH=2NaNO3+Hg+HgO↓+H2O
Hg2(NO3)2+4HNO3=2Hg(NO3)2+2NO2↑+2H2O
Hg(NO3)2+H2O=HgO↓+2HNO3
Hg(NO3)2+2NaOH=2NaNO3+HgO↓+H2O
2HgO=2Hg+O2↑