Q36 / 150 · MHT CET 2026 (20 April Shift 1) · Chemistry
Which from following oxides is amphoteric in nature?
- A$\text{BaO}$
- B$\text{N}_2\text{O}_5$
- C$\text{CO}_2$
- Correct answerD$\text{Al}_2\text{O}_3$
Solution
$\text{BaO}$ is an oxide of an alkaline earth metal and is basic in nature.
$\text{N}_2\text{O}_5$ and $\text{CO}_2$ are oxides of non-metals and are acidic in nature.
$\text{Al}_2\text{O}_3$ reacts with both acids and bases to form salt and water, exhibiting both acidic and basic properties. Hence, it is an amphoteric oxide.
Reaction with acid: $\text{Al}_2\text{O}_3 + 6\text{HCl} \rightarrow 2\text{AlCl}_3 + 3\text{H}_2\text{O}$
Reaction with base: $\text{Al}_2\text{O}_3 + 2\text{NaOH} + 3\text{H}_2\text{O} \rightarrow 2\text{Na}[\text{Al}(\text{OH})_4]$
Answer: $\text{Al}_2\text{O}_3$
$\text{N}_2\text{O}_5$ and $\text{CO}_2$ are oxides of non-metals and are acidic in nature.
$\text{Al}_2\text{O}_3$ reacts with both acids and bases to form salt and water, exhibiting both acidic and basic properties. Hence, it is an amphoteric oxide.
Reaction with acid: $\text{Al}_2\text{O}_3 + 6\text{HCl} \rightarrow 2\text{AlCl}_3 + 3\text{H}_2\text{O}$
Reaction with base: $\text{Al}_2\text{O}_3 + 2\text{NaOH} + 3\text{H}_2\text{O} \rightarrow 2\text{Na}[\text{Al}(\text{OH})_4]$
Answer: $\text{Al}_2\text{O}_3$
Hence, the correct answer is option: 'D'.