Which of the following oxo acid(s) of sulphur have S - S bond ?

Options

A. Marshall acid
B. Pyrosulphuric acid
C. Pyrosulphurous acid
D. Dithionous acid

Answer

To determine which oxo acids of sulfur contain S-S bonds, we will analyze the given options step by step.

### Step 1: Identify the oxo acids of sulfur and their formulas.
1. **Marshall Acid**: Also known as peroxy disulfuric acid, its formula is H₂S₂O₈.
2. **Pyrosulfuric Acid**: Also known as disulfuric acid, its formula is H₂S₂O₇.
3. **Pyrosulfuric Acid**: The question seems to have a repetition, but if we consider it as a different compound, we will assume it refers to another oxo acid, which is H₂S₂O₅.
4. **Diethinus Acid**: Its formula is H₂S₂O₄.

### Step 2: Draw the structures of the acids to identify S-S bonds.
- **Marshall Acid (H₂S₂O₈)**: The structure has a peroxy linkage, which indicates the presence of S-S bonds.
- **Pyrosulfuric Acid (H₂S₂O₇)**: The structure shows that it contains an S-S bond.
- **Pyrosulfuric Acid (H₂S₂O₅)**: The structure does not contain an S-S bond.
- **Diethinus Acid (H₂S₂O₄)**: The structure shows that it contains an S-S bond.

### Step 3: Conclusion
From the analysis of the structures:
- **Marshall Acid (H₂S₂O₈)**: Contains S-S bond.
- **Pyrosulfuric Acid (H₂S₂O₇)**: Contains S-S bond.
- **Pyrosulfuric Acid (H₂S₂O₅)**: Does NOT contain S-S bond.
- **Diethinus Acid (H₂S₂O₄)**: Contains S-S bond.

Thus, the oxo acids of sulfur that contain S-S bonds are:
- **Marshall Acid (H₂S₂O₈)**
- **Pyrosulfuric Acid (H₂S₂O₇)**
- **Diethinus Acid (H₂S₂O₄)**

### Final Answer:
The oxo acids of sulfur that have S-S bonds are:
- Marshall Acid (H₂S₂O₈)
- Pyrosulfuric Acid (H₂S₂O₇)
- Diethinus Acid (H₂S₂O₄)

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