Составить оксид, который отвечает основанию и дать ему название Mg(OH)2, KOH, Fe(OH)2
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mgo, k2o, feo. определяется по валентности или степени окисления металла.
MgO — оксид магния.
К2О — оксид калия.
FeO — оксид железа (II), Fe2O3 — оксид железа (III).