Which of the following oxides is most basic in nature?

Options

A. `Al_2O_3`
B. `SiO_2`
C. SO_3
D. `Na_2O`

Answer

To determine which of the following oxides is most basic in nature, we need to analyze the given options: Al2O3, SiO2, SO3, and Na2O.

### Step 1: Identify the nature of each oxide
- **Al2O3 (Aluminum oxide)**: This oxide is known as amphoteric. It can react with both acids and bases, but it does not produce a strong base when treated with water.
- **SiO2 (Silicon dioxide)**: This is a non-metal oxide and is acidic in nature. It does not produce a base when treated with water.
- **SO3 (Sulfur trioxide)**: This is also a non-metal oxide and is acidic. When it reacts with water, it forms sulfuric acid (H2SO4).
- **Na2O (Sodium oxide)**: This is a metal oxide and is basic in nature. When it reacts with water, it forms sodium hydroxide (NaOH), which is a strong base.

### Step 2: Compare the basicity of the oxides
- **Al2O3**: Amphoteric (not strongly basic)
- **SiO2**: Acidic
- **SO3**: Acidic
- **Na2O**: Strongly basic

### Step 3: Conclusion
Among the given options, **Na2O** is the most basic oxide because it is a metal oxide that reacts with water to produce a strong base (NaOH).

### Final Answer
The oxide that is most basic in nature is **Na2O**.

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