1)  CuO→ CuSO4 → Cu(OH)2 → CuCl2 → Cu 2)  Na → Na2O → NaOH → Na3PO4  3)  Al → AlCl3 → Al(OH)3 → Al2O3 → Al                                                      + HCl 4) S → SO2 → H2SO3 → Na2SO3  →  ?            +H2O 5) SO3  →  X → MgSO4 → Mg 6) H2SO4 → CuSO4 → CuCl2 → Cu(OH)2 → CuO→ Cu 7) P → P2O5 → H3PO4 → Mg3(PO4)2                             ↓                         Cu3(PO4)2 → Cu → CuO                                        +HCl 8) C → CO2 → Na2CO3  →  X                ↓+H2O              Y 9) Ba → BaCl2 → BaSO4         ↓       BaO → Ba(OH)2                         +Na2O     + P2O5     10) H2 → H2O    →     X    →      X                  ↓+SO3                  Y
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