To determine which option contains two amphoteric oxides, we first need to understand what amphoteric oxides are. Amphoteric oxides are oxides that can react both as acids and bases. This means they can react with acids to form salts and water, and they can also react with bases to form complex ions. ### Step-by-Step Explanation: 1. **Identify Amphoteric Oxides:** - **Zinc Oxide (ZnO):** This is a classic example of an amphoteric oxide. It can react with acids to form zinc salts and with bases to form zincates. - **Aluminium Oxide (Al₂O₃):** This is another well-known amphoteric oxide. It can react with both acids and bases, forming aluminium salts and aluminates, respectively. - **Magnesium Oxide (MgO):** This is primarily a basic oxide, reacting with acids but not typically with bases. - **Calcium Oxide (CaO):** This is a basic oxide and does not exhibit amphoteric behavior. - **Sodium Oxide (Na₂O):** This is a strongly basic oxide and does not react with bases. - **Potassium Oxide (K₂O):** Similar to sodium oxide, this is also a basic oxide. - **Lithium Oxide (Li₂O):** This is a basic oxide as well. - **Carbon Monoxide (CO):** This is not an oxide that exhibits amphoteric behavior; it is a neutral molecule. - **Silver Oxide (Ag₂O):** This is primarily a basic oxide. - **Lead Oxide (PbO):** This can exhibit amphoteric behavior, but it is less common than zinc and aluminium oxides. 2. **Analyzing the Options:** - **Option A:** Sodium oxide (basic), Zinc oxide (amphoteric), Magnesium oxide (basic). **Contains 1 amphoteric oxide.** - **Option B:** Aluminium oxide (amphoteric), Calcium oxide (basic), Zinc oxide (amphoteric). **Contains 2 amphoteric oxides.** - **Option C:** Potassium oxide (basic), Lithium oxide (basic), Carbon monoxide (neutral). **Contains 0 amphoteric oxides.** - **Option D:** Silver oxide (basic), Lead oxide (amphoteric), Sodium oxide (basic). **Contains 1 amphoteric oxide.** 3. **Conclusion:** - The correct answer is **B** because it contains two amphoteric oxides: Aluminium oxide and Zinc oxide. ### Why Other Options Are Incorrect: - **Option A:** Contains only one amphoteric oxide (Zinc oxide). - **Option C:** Contains no amphoteric oxides at all. - **Option D:** Contains only one amphoteric oxide (Lead oxide). ### Summary of Key Points: - Amphoteric oxides can react with both acids and bases. - Zinc oxide and Aluminium oxide are common examples of amphoteric oxides. - Basic oxides do not exhibit amphoteric behavior. - The correct option (B) contains two amphoteric oxides, making it the right choice. ### Revision Summary: - Amphoteric oxides can act as both acids and bases. - Key examples include Zinc oxide (ZnO) and Aluminium oxide (Al₂O₃). - Basic oxides do not show amphoteric properties. - Option B is correct as it contains two amphoteric oxides.