Which of the following is amphoteric oxide?
`Mn_(2)O_(7),CrO_(3),Cr_(2)O_(3),CrO,V_(2)O_(5),V_(2)O_(4)`

Options

A. `V_(2)O_(5),Cr_(2)O_(3)`
B. `Mn_(2)O_(7), CrO_(3)`
C. `CrO, V_(2)O_(5)`
D. `V_(2)O_(5), V_(2)O_(4)`

Explanation

To determine which of the given oxides is amphoteric, we need to analyze each oxide based on its ability to act as both an acid and a base. Amphoteric oxides can react with both acids and bases, demonstrating their dual nature.

### Step-by-Step Solution:

1. **Understanding Amphoteric Oxides**:
- Amphoteric oxides can behave as both acidic and basic oxides. They can react with acids to form salts and water, and they can also react with bases to form complex ions.

2. **Analyzing Each Oxide**:
- **Mn₂O₇**:
- Manganese in Mn₂O₇ has an oxidation state of +7. This high oxidation state indicates that it is a strong oxidizing agent and cannot act as a reducing agent. Therefore, it cannot be amphoteric.

- **CrO₃**:
- Chromium in CrO₃ has an oxidation state of +6. Similar to Mn₂O₇, it is also a strong oxidizing agent and cannot act as a reducing agent. Thus, it is not amphoteric.

- **Cr₂O₃**:
- Chromium in Cr₂O₃ has an oxidation state of +3. This oxide can react with both acids and bases, showing its amphoteric nature. It can reduce other elements and can also act as an acid. Therefore, Cr₂O₃ is amphoteric.

- **CrO**:
- Chromium in CrO has an oxidation state of +2. This oxide primarily behaves as a basic oxide and does not show amphoteric behavior.

- **V₂O₅**:
- Vanadium in V₂O₅ has an oxidation state of +5. V₂O₅ can react with both acids and bases, thus exhibiting amphoteric properties. It can form VO₂⁺ and VO₄³⁻ ions, confirming its amphoteric nature.

- **V₂O₄**:
- Vanadium in V₂O₄ has an oxidation state of +4. This oxide does not exhibit amphoteric behavior and primarily acts as a basic oxide.

3. **Conclusion**:
- From the analysis, we find that the amphoteric oxides among the given options are **Cr₂O₃** and **V₂O₅**.

### Final Answer:
The amphoteric oxides from the options provided are **Cr₂O₃ and V₂O₅**.

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