Какое уравнение соответствует реакции соединения? 1) Fe+2HCl=FeCl2+H2
2) 4Fe(OH)2+O2+2H2O=4Fe(OH)3
3) Cu(OH)2=CuO+H2O
4) Na3PO4+3HNO3=3NaNO3+H3PO4
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