Какое уравнение соответствует реакции обмена?

1) Mg + 2HCl = MgCl2 + H2
2) K2O + CO2 = K2CO3
3) ZnCl2 + 2AgNO3 = Zn(NO3)2 + 2AgCl
4) H2SO4 + Fe = FeSO4 + H2
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