Which of the following is an amphoteric oxide?

Options

A. `V_2O_5,Cr_2O_3`
B. `Mn_2O_7,CrO_3`
C. `CrO,V_2O_5`
D. `V_2O_5,V_2O_4`

Answer

To determine which of the following oxides is amphoteric, we will analyze each option provided. Amphoteric oxides can react with both acids and bases, showing characteristics of both.

### Step-by-Step Solution:

1. **Identify the Oxides**: The oxides we need to analyze are V2O5, Cr2O3, Mn2O7, and CrO3.

2. **Analyze V2O5**:
- V2O5 (Vanadium pentoxide) is known to be amphoteric. It can react with acids as well as bases.
- **Conclusion**: V2O5 is amphoteric.

3. **Analyze Cr2O3**:
- Cr2O3 (Chromium(III) oxide) is also amphoteric. It can react with both acids and bases.
- **Conclusion**: Cr2O3 is amphoteric.

4. **Analyze Mn2O7**:
- Mn2O7 (Manganese(VII) oxide) is acidic. It does not exhibit amphoteric behavior as it primarily reacts with bases.
- **Conclusion**: Mn2O7 is not amphoteric.

5. **Analyze CrO3**:
- CrO3 (Chromium(VI) oxide) is also acidic. It does not show amphoteric properties.
- **Conclusion**: CrO3 is not amphoteric.

6. **Final Conclusion**:
- The amphoteric oxides identified are V2O5 and Cr2O3. Therefore, both are correct answers to the question regarding which of the following is an amphoteric oxide.