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3 Co + HCl (p)  11 Co + HCl (к) 
Ba + HNO 3(к)  Sn + MgSO 4
Ba + KOH Mg + HNO 3(p) 
Zn + HgSO 4 Hg + H 2O
4 K + H 2SO 4(k)  12 Ba + CrCl 3
Au + H 2O Ca + NaOH
Ni + HNO 3(p)  Fe + HNO 3(p) 
Fe + PbCl 2 Zn + H 2SO 4(p) 
5 Cd + H 2SO 4(k)  13 Cd + HCl (p) 
Pb + Zn(NO 3) 2 Zn + H 2SO 4(k) 
Mn + HCl (p)  Bi + H 2O
Ca + NaOH Sn + AgNO 3
6 Al + NiSO 4 14 Al + H 2SО 4(p) 
Ba + H 2O Co + HgCl 2
Bi + HCl (k)  Pb + KOH
Li + HNO 3(p)  Br + HNO 3(k) 
7 Zn + KOH 15 Na + H 2O
Fe + HCl(p)  Zn + HCl (p) 
Al + NaOH +H 2O  Ba + Pb(NO 3) 2
Mg + AgNO 3 Sn + NaOH +Н 2О
8 Ca + HNO 3(p)  16 Mg + H 2SO 4(p) 
Al + NaOH Be + NaOH 
Ag + HCl (k)  Hg + HCl (k) 
Sn + CuSO 4 Pb + CuSO 4

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