The correct decreasing order of acidic strength of trioxides of nitrogen family is
A. \(P_2O_3\)
B. \(N_2O_3\)
C. \(As_2O_3\)
D. \(Bi_2O_3\)
E. \(Sb_2O_3\)
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → B > A > C > E > D
In group 15 the acidic character of the oxides decreases down the group as the metallic character of the element increases:
B \( \ce{N2O3} \) — nitrogen, the most non-metallic: most acidic.
A \( \ce{P2O3} \) — phosphorus: acidic.
C \( \ce{As2O3} \) — arsenic: amphoteric.
E \( \ce{Sb2O3} \) — antimony: amphoteric, less acidic than the arsenic oxide.
D \( \ce{Bi2O3} \) — bismuth, the most metallic: predominantly basic, least acidic.
Note: This question is from the pre-rationalised NCERT book (2022-23). The topic is not there in the latest NCERT book (2026-27), and it is also out of the CUET 2026 syllabus.
NCERT (Pre-rationalised edition, 2022-23):
Reactivity towards Oxygen
