The oxide which is most acidic is :

Options

A. `Bi_2O_3`
B. `As_2O_(3)`
C. `P_2O_3`
D. `N_2O_3`

Answer

To determine the most acidic oxide among the given options, we can follow these steps:

### Step 1: Identify the Oxides
First, we need to identify the oxides in question. The oxides mentioned in the video transcript are related to the nitrogen family (Group 15), which includes nitrogen (N), phosphorus (P), arsenic (As), antimony (Sb), and bismuth (Bi). The relevant oxides are:
- Nitrogen: N2O3
- Phosphorus: P2O3
- Arsenic: As2O3
- Antimony: Sb2O3
- Bismuth: Bi2O3

### Step 2: Classify the Oxides
Next, we classify these oxides based on their acidic or basic nature:
- **Acidic Oxides**: N2O3, P2O3
- **Amphoteric Oxides**: As2O3, Sb2O3
- **Basic Oxides**: Bi2O3

### Step 3: Compare Acidic Oxides
Among the acidic oxides, we need to compare N2O3 and P2O3. Generally, as we move from nitrogen to phosphorus in the group, the acidic character tends to decrease due to the increase in metallic character.

### Step 4: Analyze Trends
- **Atomic Size**: As we move down the group from nitrogen to phosphorus, the atomic size increases, which affects the ionization energy. Larger atoms have lower ionization energy, making them more metallic and less acidic.
- **Metallic Character**: Phosphorus has a higher metallic character compared to nitrogen, which means phosphorus oxides are less acidic than nitrogen oxides.

### Step 5: Conclusion
Since N2O3 (from nitrogen) is more acidic than P2O3 (from phosphorus), we conclude that the most acidic oxide among the options is **N2O3**.

### Final Answer
The oxide which is most acidic is: **N2O3**.

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