Which among the following are peroxo acid of sulphur ?

Options

A. `H_2 SO_3`
B. `H_2 SO_5`
C. `H_2 S_2 O_8`
D. `H_2 SO_4`

Explanation

To determine which among the given options are peroxo acids of sulfur, we need to analyze each compound based on its structure and classification.

### Step-by-Step Solution:

1. **Understanding Peroxo Acids**:
- Peroxo acids are acids that contain a peroxyl group (–O–O–). This means that they have an oxygen-oxygen single bond in their structure.

2. **Analyzing Each Option**:
- **H2SO3 (Sulfurous Acid)**:
- Structure: H2SO3 does not contain a peroxyl linkage. It is a simple sulfur compound with no O-O bond.
- Conclusion: Not a peroxo acid.

- **H2SO5 (Peroxomonosulfuric Acid)**:
- Structure: H2SO5 contains a peroxyl group (–O–O–) in its structure.
- Conclusion: This is a peroxo acid.

- **H2SO8 (Peroxodisulfuric Acid)**:
- Structure: H2SO8 also contains a peroxyl group (–O–O–) in its structure.
- Conclusion: This is also a peroxo acid.

- **H2SO4 (Sulfuric Acid)**:
- Structure: H2SO4 does not contain a peroxyl linkage. It is a well-known strong acid with no O-O bond.
- Conclusion: Not a peroxo acid.

3. **Final Conclusion**:
- From the analysis, the peroxo acids of sulfur among the given options are:
- H2SO5 (Peroxomonosulfuric Acid)
- H2SO8 (Peroxodisulfuric Acid)

### Answer:
The peroxo acids of sulfur among the given options are **H2SO5 and H2SO8**.