Какое уравнение соответствует реакций обмена?
1) CaO+H2O--->Ca(OH) 2
2) 2HgO--->2Hg+O2
3)2HCL+Ba(OH)2-->BaCL2+2H2O
4) 2Na+2H2O--->2NaOH+H2
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