Among the following, the intensive property is (properties are):

Options

A. molar conductivity
B. electromotive force
C. resistance
D. heat capacity

Explanation

To determine which among the given options is an intensive property, we first need to understand what an intensive property is. Intensive properties are those properties that do not depend on the amount or size of the system. Instead, they depend on the nature of the material itself.

Let's analyze the options one by one:

1. **Molar Conductivity**:
- Molar conductivity (Λ) is defined as the conductivity (K) of a solution divided by its molar concentration (C). The formula is given by:
\[ \Lambda = \frac{K}{C} \]
- Molar conductivity does not depend on the amount of substance taken; it is a property that remains constant for a given concentration. Therefore, molar conductivity is an **intensive property**.

2. **Electromotive Force (EMF)**:
- EMF is the potential difference that drives the flow of electric current in a circuit. It can be influenced by the concentration of reactants in an electrochemical cell, but the EMF itself is a characteristic of the system and does not depend on the size or mass of the system. Thus, EMF is also considered an **intensive property**.

3. **Resistance**:
- Resistance (R) is defined as the opposition to the flow of electric current and is given by the formula:
\[ R = \frac{\rho L}{A} \]
- Here, ρ is the resistivity, L is the length of the conductor, and A is the cross-sectional area. Resistance depends on the dimensions (length and area) and thus varies with the size of the material. Therefore, resistance is an **extensive property**.

4. **Heat Capacity**:
- Heat capacity (C) is the amount of heat required to change the temperature of a substance by 1 degree Celsius. It is directly proportional to the mass of the substance; hence, it varies with the amount of material present. Therefore, heat capacity is also an **extensive property**.

### Conclusion:
From the analysis above, the intensive properties among the options provided are:
- **Molar Conductivity** (Option 1)
- **Electromotive Force** (Option 2)

### Final Answer:
The intensive properties are **Molar Conductivity** and **Electromotive Force**.

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