Sodium chromate, Na2CrO4 is made commercially by : — d and f Block Elements Chemistry Question

💡 Solution & Explanation

Step 1: Amphoteric oxides can react with both acids and bases to form salts and water. Step 2: Al2O3 (from Al3+), Cr2O3 (from Cr3+), and ZnO (from Zn2+) are well-known amphoteric oxides. Step 3: In contrast, iron(III) oxide (Fe2O3, from Fe3+) is purely basic and does not react with bases under normal conditions. Therefore, Fe^3+ oxide is not amphoteric, corresponding to option (c).