Which of the following is amphoteric oxide?

$M{n}_2{O}_7,Cr{O}_3,C{r}_2{O}_3,CrO,V_2{O}_5,V_2{O}_4$

The correct option is D $V_2{O}_5,C{r}_2{O}_3$

In chemistry, an amphoteric species is a molecule or ion which can react as an acid as well as a base. This word is derived from the Greek word amphotericin which is meant for "both". Many metals like zinc, tin, lead, aluminium, beryllium, etc form amphoteric oxides or hydroxides.

Here both $V_2{O}_5$ and $C{r}_2{O}_3$ can show the property of acidic as well as basic oxide both.

Thus option A is correct.