Acid that contains `S-O-S` linkage is

Options

A. `H_(2)S_(2)O_(7)`
B. `H_(2)S_(2)O_(5)`
C. `H_(2)S_(2)O_(6)`
D. `H_(2)S_(2)O_(4)`

Answer

To determine which acid contains an `S-O-S` linkage, we need to analyze the given options and their structures. The options provided are:

1. H₂S₂O₇ (Disulfuric acid)
2. H₂S₂O₅ (Disulfurous acid)
3. H₂S₂O₆ (Diethinic acid)
4. H₂S₂O₄ (Diethinous acid)

### Step-by-Step Solution:

**Step 1: Identify the acids and their structures.**
- H₂S₂O₇: Known as disulfuric acid.
- H₂S₂O₅: Known as disulfurous acid.
- H₂S₂O₆: Known as diethinic acid.
- H₂S₂O₄: Known as diethinous acid.

**Step 2: Analyze the structures for `S-O-S` linkages.**
- **H₂S₂O₇**: The structure shows an `S-O-S` linkage where each sulfur atom is bonded to an oxygen atom, forming a bridge between them.
- **H₂S₂O₅**: This structure also contains an `S-O-S` linkage.
- **H₂S₂O₆**: The structure has an `S-S` linkage instead of `S-O-S`.
- **H₂S₂O₄**: This structure also has an `S-S` linkage.

**Step 3: Conclusion on the presence of `S-O-S` linkages.**
From the analysis:
- H₂S₂O₇ and H₂S₂O₅ both contain the `S-O-S` linkage.
- H₂S₂O₆ and H₂S₂O₄ do not contain the `S-O-S` linkage.

### Final Answer:
The acids that contain `S-O-S` linkage are:
- H₂S₂O₇ (Disulfuric acid)
- H₂S₂O₅ (Disulfurous acid)