CuO+2HCl=CuCl2+H2O
2NaOH+H2SO4=Na2SO4+2H2O
Ca+H2CO3=CaCO3+H2
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CuO+2HCl=CuCl2+H2O
2NaOH+H2SO4=Na2SO4+2H2O
Ca+H2CO3=CaCO3+H2