What would happen to a reversible reaction at equilibrium when an inert gas is added while the volume remains unchanged?

Options

A. More of the product will be formed.
B. Less of the product will be formed.
C. More of the reactants will be formed
D. It remains unaffected.

Answer

To solve the question regarding the effect of adding an inert gas to a reversible reaction at equilibrium while keeping the volume unchanged, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Equilibrium**:
- A reversible reaction at equilibrium means that the rates of the forward and reverse reactions are equal, and the concentrations of reactants and products remain constant.

2. **Identifying the Factors Affecting Equilibrium**:
- The factors that can affect the position of equilibrium include changes in concentration, temperature, pressure, the addition of a catalyst, and the addition of an inert gas.

3. **Effect of Adding an Inert Gas**:
- When an inert gas is added to a system at equilibrium, it does not react with the reactants or products. Therefore, it does not change the concentrations of the reactants or products.

4. **Volume Remains Unchanged**:
- Since the volume of the system is kept constant, the addition of an inert gas does not affect the partial pressures or concentrations of the reactants and products. The total pressure of the system may increase due to the addition of the inert gas, but the individual concentrations remain the same.

5. **Conclusion**:
- Because the concentrations of the reactants and products do not change, the equilibrium position is unaffected. The equilibrium constant (Kc) remains unchanged as it depends only on the concentrations of the reactants and products at a given temperature.

### Final Answer:
When an inert gas is added to a reversible reaction at equilibrium while the volume remains unchanged, there is no change in the state of equilibrium of the system.