How many of these properties are intensive here Temperature, Refractive index, density, enthalpy, entropy, molar heat capacity, Gibb's free energy, pH.

Answer

To determine how many of the given properties are intensive, we first need to understand the definitions of intensive and extensive properties.

### Step-by-Step Solution:

1. **Define Intensive and Extensive Properties**:
- **Intensive Properties**: These properties do not depend on the amount of substance present. They are inherent to the material itself. Examples include temperature, refractive index, density, and pH.
- **Extensive Properties**: These properties depend on the amount of substance present. Examples include enthalpy, entropy, and Gibbs free energy.

2. **Analyze Each Property**:
- **Temperature**: This is an intensive property because it does not change with the amount of substance.
- **Refractive Index**: This is also an intensive property as it is a ratio and does not depend on the amount of the substance.
- **Density**: Density is defined as mass per unit volume (mass/volume), making it an intensive property since it is a ratio.
- **Enthalpy**: This is an extensive property because it depends on the amount of substance present.
- **Entropy**: Like enthalpy, entropy is also an extensive property as it depends on the amount of substance.
- **Molar Heat Capacity**: This is considered an intensive property because it is defined per mole of substance, making it independent of the total amount.
- **Gibbs Free Energy**: This is an extensive property since it depends on the amount of substance.
- **pH**: pH is an intensive property because it is a measure of the concentration of hydrogen ions, which does not depend on the amount of the substance.

3. **Count the Intensive Properties**:
- From the analysis, we find the following intensive properties:
- Temperature
- Refractive Index
- Density
- Molar Heat Capacity
- pH
- Total: 5 intensive properties.

### Final Answer:
There are **5 intensive properties** among the given options.