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1. S → SO3 → H2SO4 → К2SO4 → SO3
2. Ва → ВаCl2 → ВаSO4 → ВаО → Ва(OH)2
3. С → CO2 → К2СO3 → ВаСO3 → CO2
4. К→ КCl → КОН → К2SO4 → К2O
5. Р→ Р2О5 → Н3РО4 → Nа3РО4→ Nа2О
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