Explanatory notes
… Most oxides are basic since their hydroxides act as bases. Certain oxides (anhydride oxides), however, react only with … excludes : (a) The oxides and hydroxides of Chapter 25 , particularly magnesia (magnesium oxide), whether or not … 28.43 ), of radioactive elements ( heading 28.44 ), of rare-earth metals, of yttrium or of scandium or of mixtures of …