1. Сu + О2  СuО 11. Ba(NO3)2 + СО2 + Н2О  ВаСО3 + HNO3 2. SO2 + O2  SO3 12. Fe2(SO4)3 + K3PO4  FePO4 + K2SO4 3. Na + Н2О  NaOH + Н2 13. H2SO4 + KOH  K2SO4 + H2O 4. NaOH + CO2  NaHCO3 14. Ni(NO3)2 + K2S  NiS + KNO3 5. NaHCO3  Na2CO3 + CO2 + Н2О 15. FeCl2 + Сl2  FeCl3 6. Na2CO3 + H2SO4  Na2SO4 + СО2 + Н2О 16. KBr + Cl2  KCl + Br2 7. Na2SO4 + ВаСl2  NaCl + BaSO4 17. Са3(РО4)2 + SiO2  CaSiO3 + Р2О5 8. KОН + H2S  K2S + Н2О 18. СrСl3 + NaOH  Cr(OH)3 + NaCl 9. CuO + HCl  CuCl2 + H2O 19. СО + Fe2O3  Fe3O4 + СО2 10. Na2CO3 + НСl  NaCl + СО2 + Н2О 20. Si + NaOH + H2O  Na2SiO3 + Н2
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