Which of the following anions is present in the simple single chain structure of silicate?

Options

A. `SiO_(4)^(4-)`
B. `Si_(2)O_(7)^(6-)`
C. `(Si_(2)O_(5)^(2-))_(n)`
D. `(SiO_(3)^(2-))_(n)`

Answer

To determine which anion is present in the simple single chain structure of silicates, we need to analyze the given options based on their structural characteristics.

### Step-by-Step Solution:

1. **Understanding Silicate Structures**:
- Silicates are classified based on their structural arrangements. The simple single chain structure of silicates is characterized by the sharing of oxygen atoms between silicon atoms.

2. **Analyzing the Options**:
- **Option 1: SiO4O-**
- This represents a tetrahedral structure where silicon is surrounded by four oxygen atoms. This is not a chain structure but a single unit. Therefore, it cannot be the correct answer.

- **Option 2: Si2O7^6-**
- This is known as a pyrosilicate. In this structure, two silicon atoms share one oxygen atom, forming a different arrangement that does not represent a simple chain. Hence, this is also not the correct answer.

- **Option 3: Si2O5^2-**
- This structure is characteristic of sheet silicates, where silicon atoms are arranged in a two-dimensional plane. This does not represent a single chain structure, so it is not the correct answer.

- **Option 4: SiO3^2-**
- This structure can be derived from the tetrahedral SiO4 unit. In the chain silicate structure, two oxygen atoms are shared between silicon atoms, leading to a continuous chain of SiO3 units. This is indeed the structure of a simple single chain silicate.

3. **Conclusion**:
- The correct anion that represents the simple single chain structure of silicates is **SiO3^2-**.

### Final Answer:
**SiO3^2-** is the anion present in the simple single chain structure of silicates.