Given below are the oxides :
Na2O, As2O3, N2O, NO\mathrm{Na_2O,\ As_2O_3,\ N_2O,\ NO}Na2O, As2O3, N2O, NO and Cl2O7\mathrm{Cl_2O_7}Cl2O7
Number of amphoteric oxides is :
Official answer: B
Classify. Na2O\mathrm{Na_2O}Na2O basic; As2O3\mathrm{As_2O_3}As2O3 amphoteric; N2O\mathrm{N_2O}N2O and NO neutral; Cl2O7\mathrm{Cl_2O_7}Cl2O7 acidic.
One amphoteric oxide.
(B)