Given below are the oxides :  $N{a}_{2}O,A{s}_2{O}_3,N_{2}O,NO$ and $C{l}_2{O}_{7.}$  Number of amphoteric oxides is 

Among the given options$A{s}_2{O}_3$ is an amphoteric oxide. While $N{a}_{2}O$ is basic and $C{l}_2{O}_7$ is acidic in nature $N{a}_{2}O$  and $NO$are neutral oxides.