Which of the following are peroxoacids of sulphur ?

Options

A. `H_(2)SO_(5) and H_(2)S_(2)O_(8)`
B. `H_(2)SO_(5) and H_(2)S_(2)O_(7)`
C. `H_(2)S_(2)O_(7) and H_(2)S_(2)O_(8)`
D. `H_(2)S_(2)O_(6)and H_(2)S_(2)O_(7)`

Explanation

To determine which of the given compounds are peroxoacids of sulfur, we need to identify those that contain the OOH (peroxo) group. Let's analyze each compound step by step.

### Step-by-Step Solution:

1. **Understand Peroxoacids**:
- Peroxoacids are acids that contain the peroxo group (OOH).

2. **Analyze H2SO5**:
- The structure of H2SO5 can be drawn as follows:
- It contains one sulfur atom and five oxygen atoms.
- The arrangement includes one OOH group, making it a peroxoacid.
- **Conclusion**: H2SO5 is a peroxoacid (specifically known as peroxy monosulfuric acid or carose acid).

3. **Analyze H2S2O8**:
- The structure of H2S2O8 involves two sulfur atoms and eight oxygen atoms.
- In this case, there are two OOH groups present, which confirms it as a peroxoacid.
- **Conclusion**: H2S2O8 is a peroxoacid (known as peroxydisulfuric acid).

4. **Analyze H2S2O7**:
- The structure of H2S2O7 consists of two sulfur atoms and seven oxygen atoms.
- This compound does not contain an OOH group; instead, it has an oxy linkage.
- **Conclusion**: H2S2O7 is not a peroxoacid (known as oleum or disulfuric acid).

5. **Analyze H2S2O6**:
- The structure of H2S2O6 has two sulfur atoms and six oxygen atoms.
- It does not contain an OOH group and instead forms a disulfide bond.
- **Conclusion**: H2S2O6 is not a peroxoacid (known as dithionic acid).

### Final Answer:
The peroxoacids of sulfur from the given options are:
- **H2SO5** (peroxy monosulfuric acid)
- **H2S2O8** (peroxydisulfuric acid)