Здійснити перетворення
1) Zn → ZnO → Zn(NO3)2 → Zn(OH)2
2) Fe → FeCl2 → Fe(OH)2 → FeSO4
3) Mg → MgO → MgCl2 → Mg(OH)2
4) K → K2O → KOH → KCl
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