The number of intensive properties among the following is Temperature, Pressure, Volume , Heat capacity ,Density ,pH of a solution , EMF of a cell,Entropy, Free energy,Enthalpy , Surface tension, Viscosity , Boiling point

Answer

To determine the number of intensive properties among the given list, we first need to understand the definitions of intensive and extensive properties:

- **Intensive Properties**: These are properties that do not depend on the amount of substance present. They remain the same regardless of the size or mass of the sample.
- **Extensive Properties**: These properties depend on the amount of substance present. They change when the size or mass of the sample changes.

Now, let's analyze each property listed in the question:

1. **Temperature**: Intensive property (does not depend on mass).
2. **Pressure**: Intensive property (does not depend on mass).
3. **Volume**: Extensive property (depends on mass; if you halve the sample, the volume is halved).
4. **Heat Capacity**: Extensive property (depends on mass; larger samples have greater heat capacity).
5. **Density**: Intensive property (mass cancels out; it is mass per unit volume).
6. **pH of a solution**: Intensive property (does not depend on the amount of solution).
7. **EMF of a cell**: Intensive property (does not depend on the size of the cell).
8. **Entropy**: Extensive property (depends on mass; larger systems have greater entropy).
9. **Free Energy (Gibbs Free Energy)**: Extensive property (depends on mass; changes with the amount of substance).
10. **Enthalpy**: Extensive property (depends on mass; larger systems have greater enthalpy).
11. **Surface Tension**: Intensive property (does not depend on the amount of liquid).
12. **Viscosity**: Intensive property (does not depend on the amount of liquid).
13. **Boiling Point**: Intensive property (does not depend on the amount of substance).

Now, let's count the intensive properties:

- Intensive Properties: Temperature, Pressure, Density, pH, EMF, Surface Tension, Viscosity, Boiling Point.

Total Intensive Properties = 8

### Final Answer:
The number of intensive properties among the given list is **8**.