MHTCET 13 Apr 2026 Shift 2 Paper

Concept:Amphoteric oxides react with both acids and bases to form salt and water.Explanation:$\mathrm{Al}_2\mathrm{O}_3$ is aluminium oxide.It reacts with hydrochloric acid as a base, giving aluminium chloride and water:$$\mathrm{Al}_2\mathrm{O}_3 + 6\mathrm{HCl} \rightarrow 2\mathrm{AlCl}_3 + 3\mathrm{H}_2\mathrm{O}$$It reacts with sodium hydroxide as an acid, forming sodium aluminate and water:$$\mathrm{Al}_2\mathrm{O}_3 + 2\mathrm{NaOH} \rightarrow 2\mathrm{NaAlO}_2 + \mathrm{H}_2\mathrm{O}$$Since it shows both acidic and basic behaviour, it is amphoteric in nature.Answer:Option C: Amphoteric