Select the amphoteric substance in the following : — Periodic Table and Periodicity Chemistry Question

💡 Solution & Explanation

Step 1: Analyze the chemical nature of the options: SO3 and CO2 are acidic non-metal oxides; NaOH is a strong base. Step 2: Aluminium hydroxide, Al(OH)3, reacts with both acids (forming Al^3+ salts) and strong bases (forming aluminate ions). Step 3: Because of its dual behavior as both an acid and a base, Al(OH)3 is classified as an amphoteric substance, matching option (d).