Which of the following is an extensive property of the system ?

Options

A. Volume
B. Viscosity
C. Temperature
D. Refractive index

Answer

To determine which of the following is an extensive property of the system, we need to understand the difference between extensive and intensive properties.

### Step-by-Step Solution:

1. **Definition of Extensive and Intensive Properties**:
- Extensive properties are those that depend on the amount of substance present in a system. Examples include mass, volume, and energy.
- Intensive properties are those that do not depend on the amount of substance present. Examples include temperature, density, and viscosity.

2. **Analyzing the Given Properties**:
- **Viscosity**: This property measures a fluid's resistance to flow. It remains constant regardless of the amount of liquid present. Therefore, viscosity is an intensive property.
- **Temperature**: This is a measure of the average kinetic energy of the particles in a substance. It does not change with the amount of substance, making it an intensive property.
- **Refractive Index**: This property indicates how much light is bent when entering a material. It is also independent of the amount of substance, classifying it as an intensive property.
- **Volume**: This is the amount of space that a substance occupies. Volume changes with the amount of substance present, making it an extensive property.

3. **Conclusion**:
- Among the properties analyzed, volume is the only one that is dependent on the amount of substance. Therefore, the extensive property of the system is **volume**.

### Final Answer:
The extensive property of the system is **volume**.