What common property do iodine, camphor, ammonium chloride and napthalene have?

Options

A. Equal melting points
B. Equal densities
C. Sublimation
D. None of these

Answer

To answer the question about the common property of iodine, camphor, ammonium chloride, and naphthalene, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Substances**: We have four substances: iodine, camphor, ammonium chloride (NH4Cl), and naphthalene.

2. **Research Their Properties**: Look into the physical properties of each substance. Specifically, we want to know how they behave when heated or under certain conditions.

3. **Understand Sublimation**: Sublimation is a process where a solid changes directly into a gas without passing through the liquid state.

4. **Check Each Substance**:
- **Iodine**: When heated, iodine crystals can change directly into iodine vapor.
- **Camphor**: Camphor also sublimates when heated, turning directly into vapor.
- **Ammonium Chloride**: This substance can also sublime when heated, forming ammonia and hydrochloric acid gases.
- **Naphthalene**: Naphthalene, commonly found in mothballs, sublimates as well when heated.

5. **Conclusion**: Since all four substances can change from solid to gas without becoming liquid, they share the common property of being **sublimable substances**.

### Final Answer:
The common property of iodine, camphor, ammonium chloride, and naphthalene is that they are all **sublimable substances**; they can transition from solid to gas without passing through the liquid state.

---