Select the correct statement(s)

Options

A. Double chain silicats are known as amphiboles.
B. in cyclic silicates two oxygen atoms per tetrahedron are shared.
C. Orthosilicates contain discrete `(SiO_(4))^(4-)` units.
D. General formula of cyclic silicate is `[Si_(4)O_(11)]_(n)^(6n-)`

Answer

To solve the question of selecting the correct statements regarding silicates, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Statement 1: The double chain silicates are known as mv balls.**
- **Analysis:** Double chain silicates are indeed known as amphiboles. They consist of two chains of tetrahedra that are linked together. The formula for double chain silicates can be represented as Si4O11^6-.
- **Conclusion:** This statement is **correct**.

2. **Statement 2: In cyclic silicates, the two oxygen atoms per tetrahedron are shared.**
- **Analysis:** In cyclic silicates, the tetrahedra are arranged in a closed ring structure, where each tetrahedron shares two oxygen atoms with neighboring tetrahedra. The general formula for cyclic silicates is SiO3^2-.
- **Conclusion:** This statement is **correct**.

3. **Statement 3: Orthosilicates contain discrete SiO4^4- units.**
- **Analysis:** Orthosilicates do consist of isolated SiO4^4- tetrahedra. They are simple silicates, and examples include ZrSiO4 and Zn2SiO4.
- **Conclusion:** This statement is **correct**.

4. **Statement 4: The general formula of cyclic silicate is SiO4-11N6N-.**
- **Analysis:** The general formula mentioned here does not correspond to cyclic silicates. The correct general formula for cyclic silicates is SiO3^2-.
- **Conclusion:** This statement is **incorrect**.

### Final Answer:
The correct statements are **1, 2, and 3**.

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