In which pair of ions both the species contains `S - S` bond?

Options

A. `S_(2)O_(7)^(2-), S_(2)O_(3)^(2-)`
B. `S_(4)O_(6)^(2-), S_(2)O_(3)^(2-)`
C. `S_(2)O_(7)^(2-), S_(2)O_(8)^(2-)`
D. `S_(4)O_(6)^(2-), S_(2)O_(7)^(2-)`

Explanation

To determine which pair of ions contains an S-S bond in both species, we need to analyze the structures of the relevant sulfur-containing ions. The key ions to consider are S2O7^2-, S2O3^2-, S4O6^2-, and S2O8^2-.

### Step-by-Step Solution:

1. **Identify the Ions**:
We have the following ions to analyze:
- S2O7^2-
- S2O3^2-
- S4O6^2-
- S2O8^2-

2. **Analyze S2O7^2-**:
- The S2O7^2- ion consists of two sulfur atoms and seven oxygen atoms.
- In this structure, the two sulfur atoms are bonded together, forming an S-S bond.
- The remaining oxygen atoms are arranged around the sulfur atoms, with some forming double bonds.

3. **Analyze S2O3^2-**:
- The S2O3^2- ion also consists of two sulfur atoms and three oxygen atoms.
- In this ion, there is also an S-S bond between the two sulfur atoms.
- The structure is arranged such that the sulfur atoms are bonded to each other, and the remaining oxygen atoms are bonded to the sulfur.

4. **Analyze S4O6^2-**:
- The S4O6^2- ion contains four sulfur atoms and six oxygen atoms.
- In this case, there are S-S bonds present between the sulfur atoms.
- However, we need to check if both species in the pair contain S-S bonds.

5. **Analyze S2O8^2-**:
- The S2O8^2- ion contains two sulfur atoms and eight oxygen atoms.
- Similar to the previous ions, there is an S-S bond between the two sulfur atoms.

6. **Conclusion**:
- The pairs that contain S-S bonds in both species are S2O3^2- and S4O6^2-.
- Therefore, the answer to the question is that both S2O3^2- and S4O6^2- contain S-S bonds.

### Final Answer:
The pair of ions in which both species contain an S-S bond is **S2O3^2- and S4O6^2-**.