Which of the following statements are INCORRECT? A. All the...

Lower oxidation state oxides are ionic. The highest oxidation number in the oxides, coincides with the group number and is attained in ${Sc}_{2}{O}_{3}$ to ${Mn}_{2}{O}_{7}$. The structure of ${V}_{2}{O}_{5}$ is more covalent than that of ${V}_{2}{O}_{3}$ and ${V}_{2}{O}_{4}$, which makes it more acidic. As a result, the basicity of ${V}_{2}{O}_{5}$ is greater than that of ${V}_{2}{O}_{4}$, which is in turn greater than that of ${V}_{2}{O}_{3}$.

Here in option C they have gien the increasing order of acidic character. So Option C is wrong.

${V}_{2}{O}_{4}$ dissolves in acids to give ${{VO}_{2}}^{+}$ not in ${VO}_{4}^{- 3}$ salts. So Option D is also wrong. Lower oxides are basic oxides and all chromium oxides other than $CrO$ are amphoteric oxides.