Which of the following oxides is amphoteric? Na2OP4O10Al2O3MgO

To determine which of the given oxides is amphoteric, we need to understand the concept of amphoteric oxides. Amphoteric oxides are substances that can act as both acids and bases, meaning they can react with both acids and bases.

Let's analyze each oxide:

1. Na2O: Sodium oxide is a basic oxide and does not exhibit amphoteric properties. It reacts with water to form sodium hydroxide, a strong base.

2. P4O10: Phosphorus pentoxide is an acidic oxide and does not display amphoteric behavior. It reacts with water to form phosphoric acid, a strong acid.

3. Al2O3: Aluminum oxide is the correct answer. It is an example of an amphoteric oxide. It can react with both acids and bases. For example, it reacts with acids to form salts and water, and with bases to form aluminates.

4. MgO: Magnesium oxide is a basic oxide and does not possess amphoteric properties. It reacts with water to form magnesium hydroxide, a weak base.

Therefore, the correct answer is Al2O3, which is an amphoteric oxide.