How many of the following are basic

A)${\mathrm{V}}_2{\mathrm{O}}_3$  B) ${\mathrm{V}}_2{\mathrm{O}}_4$  C) ${\mathrm{Cr}}_2{\mathrm{O}}_3$ D) ${\mathrm{V}}_2{\mathrm{O}}_5$

${\mathrm{V}}_2{\mathrm{O}}_3$  -  basic

${\mathrm{V}}_2{\mathrm{O}}_4$  - weakly basic

${\mathrm{V}}_2{\mathrm{O}}_5$  -  amphoteric with more acidic character

${\mathrm{Cr}}_2{\mathrm{O}}_3$  - amphoteric