Răspuns:
K2O + H2O => 2KOH
K2O caracter bazic
CaO + H2SO4 => CaSO4 + H2O
CaO caracter acid
CaO + H2O => Ca (OH)2
CaO caracter bazic
GeO2 + 4HCl => GeCl4 + 2H2O
GeO2 caracter acid
GeO2 + 2NaOH => Na2GeO3 + H2O
GeO2 caracter bazic
As4O10 + 6H2O => 4H3AsO4
As4O10 caracter acid