The option (s) with only amphoteric oxides is (are)

Options

A. `Cr_(2)O_(3),CrO,SnO,PbO`
B. `NO,B_(2)O_(3),PbO,SnO_(2)`
C. `Cr_(2)O_(3),BeO,SnO,SnO_(2)`
D. `ZnO,Al_(2)O_(3),PbO,PbO_(2)`

Answer

To determine which options contain only amphoteric oxides, we first need to understand what amphoteric oxides are. Amphoteric oxides can react with both acids and bases.

### Step-by-Step Solution:

1. **Define Amphoteric Oxides**:
Amphoteric oxides are those that can react with both acids and bases. This means they can either donate or accept protons (H⁺ ions).

2. **Analyze Each Option**:
- **Option A**: Cr₂O₃, CrO, SnO, PbO
- Cr₂O₃ (Chromium(III) oxide) is amphoteric.
- CrO (Chromium(II) oxide) is primarily basic.
- SnO (Tin(II) oxide) is amphoteric.
- PbO (Lead(II) oxide) is amphoteric.
- Therefore, Option A contains both amphoteric and basic oxides, so it is not correct.

- **Option B**: B₂O₃
- B₂O₃ (Boron trioxide) is an acidic oxide.
- Thus, Option B is not correct.

- **Option C**: Cr₂O₃, BeO, SnO, SnO₂
- Cr₂O₃ is amphoteric.
- BeO (Beryllium oxide) is amphoteric.
- SnO is amphoteric.
- SnO₂ (Tin(IV) oxide) is also amphoteric.
- Therefore, Option C contains only amphoteric oxides, so it is correct.

- **Option D**: ZnO, Al₂O₃, BeO, PbO
- ZnO (Zinc oxide) is amphoteric.
- Al₂O₃ (Aluminum oxide) is amphoteric.
- BeO is amphoteric.
- PbO is amphoteric.
- Therefore, Option D also contains only amphoteric oxides, so it is correct.

3. **Conclusion**:
The options with only amphoteric oxides are **Option C** and **Option D**.

### Final Answer:
The options with only amphoteric oxides are **C and D**.