The rate of a reaction that not involve gases is not dependent on:

Options

A. Pressure
B. Temperature
C. Concentration
D. Catalyst

Answer

To solve the question "The rate of a reaction that does not involve gases is not dependent on:", we need to analyze the factors that affect the rate of chemical reactions, particularly those involving solids and liquids.

### Step-by-Step Solution:

1. **Understanding Reaction Rates**: The rate of a chemical reaction refers to how quickly reactants are converted into products. Various factors can influence this rate.

2. **Identifying Factors Affecting Reaction Rates**:
- **Temperature**: Increasing temperature generally increases the kinetic energy of molecules, leading to more frequent and effective collisions, thus increasing the reaction rate.
- **Concentration**: Higher concentration of reactants typically leads to an increased rate of reaction as there are more molecules available to collide.
- **Catalysts**: Catalysts are substances that increase the rate of a reaction without being consumed in the process. They provide an alternative pathway for the reaction with a lower activation energy.

3. **Considering the Role of Pressure**:
- For reactions involving gases, pressure can significantly affect the reaction rate. Increasing pressure compresses gas molecules, leading to more collisions.
- However, for reactions involving solids and liquids, pressure does not have a significant effect. Solids and liquids are not compressible in the same way gases are, so changes in pressure do not substantially alter their reaction rates.

4. **Conclusion**: Since the question specifies reactions that do not involve gases, we conclude that the rate of such reactions is not dependent on pressure. Therefore, the correct answer is that the rate of a reaction that does not involve gases is not dependent on pressure.

### Final Answer:
The rate of a reaction that does not involve gases is not dependent on **pressure**.

---