Объяснение:
2Zn + O2 → 2ZnO,4Na + O2 → 2Na2O,4Al + 3O2 → 2Al2O3,2Mg + O2 → 2MgO,4Ag + O2 → 2Ag2O, 4Cr+ 3 O2 → 2 Cr2O3
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Объяснение:
2Zn + O2 → 2ZnO,4Na + O2 → 2Na2O,4Al + 3O2 → 2Al2O3,2Mg + O2 → 2MgO,4Ag + O2 → 2Ag2O, 4Cr+ 3 O2 → 2 Cr2O3