Знайди помилки в рівняннях та виправте їх:
1. CaO+HCl=CaCl2 +H2O
2. H2SO4 + Na2O = Na2SO4+H2
3. SO3+NaOH=Na2S+H2O
4. MgO+H2SO4=Mg2SO4+H2О
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