Объяснение:

19. Al(OH)₃ + NaOH = Na[Al(OH)₄]

20. Fe(OH)₃ + KOH = K[Fe(OH)₄]

21. ZnO + Li₂O = Li₂ZnO₂

22. ZnO + 2KOH + H₂O = K₂[Zn(OH)₄]

23. 3Fe₃O₄ + 8Al = 9Fe + 4Al₂O₃

24. Cr₂O₃ + Na₂O = 2NaCrO₂

25. Cr₂O₃ + 2KOH + 3H₂O = 2K[Cr(OH)₄]

26. 2Fe + 3H₂O (пар) = Fe₂O₃ + 3H₂

26.1 3Fe + 4H₂O (пар) = Fe₃O₄ + 4H₂

27. Ca + Br₂ = CaBr₂

28. 2Al + 2NaOH + 6H₂O = 2Na[Al(OH)₄] + 3H₂

29. 2Mg + O₂ = 2MgO

30. Be + 2NaOH + 2H₂O = Na₂[Be(OH)₄] + H₂

31. Be(OH)₂ + 2LiOH = Li₂[Be(OH)₄]

32. 6Mg + N₂ = 2Mg₃N

33. Zn + 2NaOH = Na₂ZnO₂ + H₂