1. MgO + H2SO4 = Mg(HSO4)2 + H2O
2. Hg + HCl = HgCl2 + H2
3. Fe + HCl = FeCl2 + H2
4. Fe(OH)3 + H2SO4 = Fe2(SO4)3 + H2O
5. Zn + CuSO4 = ZnSO4 + Cu
6. Zn + Hg(NO3)2 → Zn(NO3)2 + Hg
1. MgO + H2SO4 = Mg(HSO4)2 + H2O
2. Hg + HCl = HgCl2 + H2
3. Fe + HCl = FeCl2 + H2
4. Fe(OH)3 + H2SO4 = Fe2(SO4)3 + H2O
5. Zn + CuSO4 = ZnSO4 + Cu
6. Zn + Hg(NO3)2 → Zn(NO3)2 + Hg