1. Hg Hg + O2;                                                                    31. KOH +

1. Hg Hg + O2;31. KOH + AlCl3 Al(OH)3 + KCl;

2. Zn + H2SO4 ZnSO4 + H2;32. CH4 + O2 CO2 + H2O;

3. Na2S + Pb(NO3)2 PbS + NaNO333. FeO + HCl FeCl2 + H2;

4. Ca + O2 CaO;34. P2O5 + H2O H3PO4;

5. Na + H2O NaOH + H2;35. Ag2O + HCl AgCl2 + H2O;

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