Final answer:
The statement that metal oxides that are insoluble in water demonstrate their basicity by reacting with acids to produce a salt and water is True. Such metal oxides are base anhydrides and can neutralize acids even without dissolving in water.
Step-by-step explanation:
The statement that metal oxides that are insoluble in water demonstrate their basicity by reacting with acids to form a salt and water is True (A). Most metal oxides are considered base anhydrides, meaning that they can react with acids even if they do not dissolve in water to form hydroxides. A simple example is the reaction of cobalt(II) oxide with nitric acid, which produces cobalt(II) nitrate and water:
CoO(s) + 2HNO3(aq) → Co(NO3)2 (aq) + H2O(l)
Indeed, metal oxides can react with acids to neutralize the acidity and form corresponding salts and water, displaying their basic properties.