-Almost all metal oxides can be prepared by this method.
-Alkali oxide are soluble in water except which is partially soluble in water.
-Alkaline earth metal oxides are sparingly soluble in water.
-Other oxides are insoluble in water.
Action of heat:
-Almost all metal oxides are thermally stable except and
-Reacts with acid to form salt and water.
-They are metallic oxides.
-They changes red litmus paper to blue.
-Reacts with base to form salt and water.
-They are non-metallic oxides.
-They changes blue litmus to red
-Shows neither acidic nor basic character.
-Neutral towards litmus test.
-It is metallic oxide of few metals, which can show both acidic and basic properties.
-Reacts with both strong acid and alkali to produce salt and water.
-Treated with dil. acid to yield .
-Oxidation state of oxygen on peroxide is .
-Treated with dil. acid to yield and .
-Oxidation state of oxygen on superoxide is .
-Oxides which are the mixture of two or more oxides.
- is the mixture of and
-Contain lesser number of oxygen than required according to valency.
-Eg: , etc.