On heating, camphor changes into vapour form. It is a following type a change.

Options

A. temporary and irreversible
B. temporary and chemical
C. physical and reversible
D. chemical and reversible

Explanation

To determine the type of change that occurs when camphor is heated and changes into vapor, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Initial State**:
- Camphor is initially in a solid state.

2. **Heating Process**:
- When camphor is heated, it undergoes a transformation.

3. **Change of State**:
- The solid camphor changes directly into vapor without passing through a liquid state. This process is known as sublimation.

4. **Reversibility of the Process**:
- The change is reversible; if the vapor is cooled, it can condense back into solid camphor.

5. **Classification of the Change**:
- Since only the physical state of camphor is changing (from solid to gas), and it can revert back to its original state, this is classified as a physical change.

6. **Final Conclusion**:
- Therefore, the type of change that camphor undergoes when heated is a physical change, and it is reversible.

### Final Answer:
The correct answer is that the change is a **physical change**.

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