How many of the following are amphoteric oxides?
`Li_(2)O,Na_(2)O_(2),BeO,Al_(2)O_(3),MgO,BaO_(2)`

Answer

To determine how many of the given oxides are amphoteric, we need to analyze each oxide based on its chemical properties. Amphoteric oxides are those that can react with both acids and bases.

### Step-by-Step Solution:

1. **Identify the Oxides**: The oxides we need to analyze are:
- Li₂O
- Na₂O₂
- BeO
- Al₂O₃
- MgO
- BaO₂

2. **Analyze Each Oxide**:
- **Li₂O (Lithium Oxide)**: This oxide is basic in nature. It does not react with acids or bases to show amphoteric behavior.
- **Na₂O₂ (Sodium Peroxide)**: This is also basic and does not exhibit amphoteric properties.
- **BeO (Beryllium Oxide)**: This oxide is amphoteric. It can react with both acids and bases.
- **Al₂O₃ (Aluminum Oxide)**: This oxide is also amphoteric. It can react with both acids and bases.
- **MgO (Magnesium Oxide)**: This oxide is basic and does not show amphoteric behavior.
- **BaO₂ (Barium Peroxide)**: This is basic and does not exhibit amphoteric properties.

3. **Count the Amphoteric Oxides**: From our analysis, we find that:
- BeO is amphoteric.
- Al₂O₃ is amphoteric.
- The others (Li₂O, Na₂O₂, MgO, BaO₂) are not amphoteric.

4. **Conclusion**: Therefore, there are **2 amphoteric oxides** in the given list: BeO and Al₂O₃.

### Final Answer:
**2 amphoteric oxides (BeO and Al₂O₃)**.

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