Solids generally undergo melting on heating. But only certain specific solids like naphthalene camphor undergo sublimation. Give a reason.

Explanation

### Step-by-Step Solution:

1. **Understanding the Behavior of Solids on Heating**:
- When most solids are heated, they absorb energy which causes their particles to vibrate more vigorously. This increased energy can eventually overcome the forces holding the particles together, leading to a phase change from solid to liquid. This process is called melting.

2. **Identifying Specific Solids that Sublime**:
- However, certain solids, such as naphthalene and camphor, behave differently when heated. Instead of melting into a liquid, they transition directly into the vapor phase. This process is known as sublimation.

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