Question

Which of the following sets are correctly matched?
i. P$_2$O$_3$, N$_2$O$_4$ - acidic
ii. N$_2$O, NO - neutral
iii. SeO$_3$, TeO$_3$ - basic
iv. As$_2$O$_3$, Sb$_2$O$_3$ - amphoteric
The correct option is

• A. i, ii, iv only
• B. i, ii, iii only
• C. i, ii, iii, iv
• D. ii, iii only

Hint:

Non-metal oxides are acidic or neutral; metal oxides may be basic or amphoteric. Group 15/16 oxides trend: As, Sb amphoteric; Se, Te acidic. Test reactions with acids/bases.

Answer 1

The Correct Option is A

1. i. P$_2$O$_3$, N$_2$O$_4$: Form acidic oxides (H$_3$PO$_3$, HNO$_3$), correct.
2. ii. N$_2$O, NO: Neutral oxides (minimal reaction with water), correct.
3. iii. SeO$_3$, TeO$_3$: Acidic (form selenic, telluric acids), not basic, incorrect.
4. iv. As$_2$O$_3$, Sb$_2$O$_3$: Amphoteric (react with acids and bases), correct.
5. Thus, i, ii, iv are correct, so the answer is (1).