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1. 2Na + 2H2O A --> 2NaOH B+ H2 C
2. H2 C+ O2 --> H2O A
3. 4Na + O2 --> 2Na2O
4. Na2O + H2O A --> 2NaOH B
5. NaOH B--> Na+ + OH-
6. Ca(OH)2 --> Ca2+ D + 2OH- E
b)
1. Ba + 2H2O A--> Ba(OH)2 B+ H2
2. 4K C+ O2 --> 2K2O
3. 2Ba + O2 --> 2BaO
4. BaO D+ H2O A--> Ba(OH)2 B
5. Ba(OH)2 B--> Ba2+ + 2OH- E
6. KOH F--> K+ + OH- E
c)
1. Li2O + H2O A--> 2LiOH B
2. 3Cl2 C + 2Cr D--> 2CrCl3
3. 3LiOH B+ CrCl3 --> Cr(OH)3 E+ 3LiCl
4. 2Li + Cl2 C--> 2LiCl
5. 2H2O A+ 2Li F --> 2LiOH B+ H2
6. LiOH B--> Li+ + OH-
7. 2H2 + O2 --> 2H2O A
d)
1. Cu + Br2 A--> CuBr2
2. AlCl3 + 3KOH B--> Al(OH)3 + 3KCl D
3. CuBr2 + 2KOH B--> Cu(OH)2 + 2KBr
4. Br2 A+ 2K C--> 2KBr
5. 2K C+ Cl2 --> 2KCl D