AP EAMCET Engineering 17 Sep 2020 Shift 2 Paper

The oxides of the type

+3

E2

O3 of N and P,P2O3
(P4O6, dimer of P2O3) are purely acidic, that of As (As4O6, dimer of As2O3) and Sb(Sb4O6, dimer of Sb2O3 ) amphoteric and that of Bi(Bi2O3) is predominantly basic.
The oxides of the type

+3

E2

O5 are more acidic, e.g. N2O5,P2O5,As2O5,Sb2O5
So, in the given set of oxides of group- 15 elements, two oxides are amphoteric, As4O6 and Sb4O6