Why is latent heat of fusion of solid carbon dioxide less than that of silicon dioxide ?

Explanation

To understand why the latent heat of fusion of solid carbon dioxide (CO2) is less than that of silicon dioxide (SiO2), we need to analyze the nature of these two substances and the forces that hold their particles together.

### Step-by-Step Solution:

1. **Identify the Types of Solids**:
- Solid carbon dioxide (CO2) is classified as a molecular solid.
- Silicon dioxide (SiO2) is classified as a covalent (network) solid.

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