Изменение свойств оксидов от основных к кислотным происходит в рядах:
1)Li2O-BeO-B2O3
2)Cl2O7-SO3-P2O5
3)SO3-P2O5-SiO2
4)BaO-MgO-CaO
5)MgO-Al2O3-SiO2
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