Оберіть реакцію обміну

3H2SO4 + 2Fe(OH)3 = Fe2(SO4)3 + 6Н2О
3Zn + 2H3PO4 = Zn3(PO4)2 + 3Н2↑
CaO + CO2=CaCO3
CaCO3=CaO + CO2
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