Example of a network covalent solid is :

Options

A. `SO_(2)` (solid)
B. `H_(2)O` (Ice)
C. `l_(2)`
D. Diamond

Explanation

**Step-by-Step Text Solution:**

1. **Understanding Network Covalent Solids**:
- Network covalent solids are characterized by a three-dimensional network of covalent bonds. This means that the atoms in these solids are bonded together in a continuous network, rather than being arranged in discrete molecules.

2. **Identifying Examples**:
- Common examples of network covalent solids include diamond, silicon carbide (SiC), and quartz (SiO2). Each of these materials has a strong covalent bonding structure that extends throughout the entire solid.

3. **Conclusion**:
- Therefore, an example of a network covalent solid is diamond, which is known for its hardness and high melting point due to the strong covalent bonds between carbon atoms arranged in a tetrahedral structure.