Which of the following is a network solid

Options

A. `SO_2` (Solid)
B. `I_2`
C. Diamond
D. `H_2O` (ice)

Explanation

To determine which of the following is a network solid, we need to understand the characteristics of network solids. Network solids are materials where atoms are bonded covalently in a continuous network, forming a three-dimensional structure without distinct molecular units.

Let's analyze each option step by step:

1. **Option 1: Sulphur Dioxide (SO₂)**
- Sulphur dioxide is a molecular compound. It consists of discrete SO₂ molecules held together by intermolecular forces (like van der Waals forces) rather than a continuous network of covalent bonds.
- **Conclusion:** Sulphur dioxide is not a network solid.

2. **Option 2: Iodine (I₂)**
- Iodine exists as diatomic molecules (I₂). While there are covalent bonds between the two iodine atoms in each molecule, these molecules do not form a continuous network. Instead, they exist as individual units.
- **Conclusion:** Iodine is not a network solid.

3. **Option 3: Diamond**
- Diamond is an allotrope of carbon where each carbon atom is covalently bonded to four other carbon atoms in a three-dimensional tetrahedral structure. This extensive bonding creates a continuous network throughout the entire crystal.
- **Conclusion:** Diamond is a network solid.

4. **Option 4: Water Ice (H₂O)**
- Ice is a solid form of water, which consists of water molecules. Although ice has hydrogen bonds between water molecules, it does not form a continuous network of covalent bonds like a network solid. Instead, it has a molecular structure.
- **Conclusion:** Water ice is not a network solid.

**Final Answer:** The network solid among the given options is **Diamond**.