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7 Periodic Properties of the Elements Solutions to Exercises 7.63 (a) When dissolved in water, an "acidic oxide" produces an acidic (pH 7) solution. (b) Oxides of nonmetals are acidic. Example: SO₃(g) + Oxides of metals are basic. Example: CaO (quick lime). CaO(s) + Ca(OH)₂(aq). 7.64 The more nonmetallic the central atom, the more acidic the oxide. In order of increasing acidity: CaO