In which one of the following pairs of oxides, both oxides behave as amphoteric oxides ?

Options

A. `Cl_(2)O_(7), As_(2)O_(3)`
B. `Al_(2)O_(3), As_(2)O_(3)`
C. `Al_(2)O_(3), Cl_(2)O_(3)`
D. `Cl_(2)O_(7), SO_(3)`

Explanation

To determine which pair of oxides contains both oxides that behave as amphoteric oxides, we need to first understand the definition of amphoteric oxides. Amphoteric oxides are those that can react with both acids and bases to form salts and water.

### Step-by-Step Solution:

1. **Understand Amphoteric Oxides**:
- Amphoteric oxides can react with both acids and bases. They can dissolve in acidic solutions to form salts and water, and they can also react with basic solutions.

2. **Analyze the Given Options**:
- We need to evaluate each pair of oxides provided in the options to see if both oxides in the pair are amphoteric.

3. **Option 1: Cl2O7 and another oxide**:
- Cl2O7 is a strong acidic oxide. It does not behave as an amphoteric oxide. Therefore, this option cannot be correct.

4. **Option 2: Al2O3 and As2O3**:
- Al2O3 (aluminum oxide) is amphoteric. It can react with acids and bases.
- As2O3 (arsenic oxide) is also amphoteric. It can react with both acids and bases.
- Since both oxides in this pair are amphoteric, this option is a candidate for the correct answer.

5. **Option 3: Cl2O3 and another oxide**:
- Cl2O3 is a strong acidic oxide. Therefore, this option cannot be correct.

6. **Option 4: Another pair of oxides**:
- If both oxides in this pair are acidic, then they cannot be amphoteric. Thus, this option also cannot be correct.

7. **Conclusion**:
- The only pair where both oxides behave as amphoteric is **Option 2: Al2O3 and As2O3**.

### Final Answer:
The correct answer is **Option 2: Al2O3 and As2O3**.