Answer:
1. Na₃PO₄ + 3 KOH → 3 NaOH + K₃PO₄
2. Li₂CO₃ + MgF₂ → 2 LiF + MgCO3₃
3. P4 + 3 O₂ → 2 P₂O₃
4. 2 RbNO₃ + BeF₂ —> Be(NO₃)₂ + 2 RbF
5. 2 AgNO₃ + Cu = Cu(NO₃)₂ + 2 Ag
6. CF₄ + 2 Br₂ = CBr₄ + 2 F₂
7. 2 HCN + CuSO₄ → Cu(CN)₂ + H₂SO4₄
8. GaF₃ + 3 Cs → 3 CsF + Ga
9. BaS + PtF₂ → BaF₂ + PtS
10. N₂ + 3 H₂ = 2 NH₃
11. Br₂ + 2NaF =2 NaBr + F₂
12. PB(OH)₂ + 2 HCl = 2 H₂O + PBCl₂
13. 2 AlBr₃ + 3 K₂SO₄ = 6 KBr + Al₂(SO₄)3₃
14. CH₄ + 2 O₂ = CO₂ + 2 H₂O
15. 3 CaCl₂ + 2 Na₃PO₄ → Ca₃(PO₄)₂ + 6 NaCl
16. 2K + Cl₂ = 2KCl
17. 2 AL + 2 HCl = 2 ALCl + H₂
18. N₂ + 3 F₂ = 2 NF3₃
19. SO₂ + 2Li₂Se → 2Li₂O + SSe₂
20. 2 NH₃ + H₂SO₄ → (NH₄)₂SO₄
