The Actinoids

Step 1: Definition of Amphoteric Oxide
An amphoteric oxide is an oxide that can react with both acids and bases to form salt and water.
Step 2: Identifying as an Amphoteric Oxide
Chromium(III) oxide is an amphoteric oxide because: - It reacts with acids (e.g., ) to form : - It reacts with bases (e.g., NaOH) to form chromates:
Step 3: Conclusion
Since can react with both acids and bases, it is classified as an amphoteric oxide.