Which of the following is an amphoteric oxide ?

Options

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

Answer

To determine which of the following is an amphoteric oxide, we need to understand what amphoteric oxides are. Amphoteric oxides are oxides that can react both as acids and bases. They typically belong to elements that have intermediate electronegativity and can exhibit multiple oxidation states.

### Step-by-Step Solution:

1. **Identify Common Oxides**:
- First, list the common oxides of metals and non-metals. For example, we can consider oxides like Na2O (sodium oxide), MgO (magnesium oxide), Al2O3 (aluminum oxide), SiO2 (silicon dioxide), and ZnO (zinc oxide).

2. **Determine Acidic and Basic Nature**:
- Basic oxides are generally formed by metals (like Na2O, MgO) and react with acids.
- Acidic oxides are typically formed by non-metals (like SO2, CO2) and react with bases.
- Amphoteric oxides can react with both acids and bases.

3. **Examine Each Oxide**:
- **Na2O**: Basic oxide, reacts with acids.
- **MgO**: Basic oxide, reacts with acids.
- **Al2O3**: Amphoteric oxide, can react with both acids and bases.
- **SiO2**: Acidic oxide, reacts with bases.
- **ZnO**: Amphoteric oxide, can react with both acids and bases.

4. **Conclusion**:
- From the examination, Al2O3 and ZnO are amphoteric oxides. However, if the question provides specific options, you would choose the one that is listed.

5. **Final Answer**:
- If Al2O3 or ZnO is among the options, then either of them is the correct answer as amphoteric oxides.