Arrange the following oxides in the order of their increasing acidity : `CrO_(3), CrO, Cr_(2)O_(3)`.

Explanation

The oxidation states of Cr in the given oxides are in the order +6, +2 and + 3, respectively. Therefore, the increasing order of acidity : `CrO lt Cr_(2)O_(3)lt CrO_(3)`. This is because, the acidity of the oxides made from the same metal increases with increases in the oxidation number of the metal.