Select correct statement

Options

A. `K_(p)=Q_(p)`
B. `Q_(p)gt K_(p)`
C. `Q_(p) lt K_(p)`
D. `K_(p) = Q_(p) =1`

Explanation

To solve the question of selecting the correct statement regarding the equilibrium constant (Kp) and the reaction quotient (Qp), we need to analyze the given statements based on the definitions and relationships between Kp and Qp.

### Step-by-Step Solution:

1. **Understanding Kp and Qp**:
- Kp is the equilibrium constant for a reaction at a given temperature, expressed in terms of the partial pressures of the gaseous reactants and products.
- Qp is the reaction quotient, which is calculated in the same way as Kp but can be evaluated at any point in time, not just at equilibrium.

2. **Analyzing the Statements**:
- **Statement 1**: Kp = Qp
- This statement is true when the system is at equilibrium. At equilibrium, the reaction quotient (Qp) is equal to the equilibrium constant (Kp).

- **Statement 2**: Qp > Kp
- This statement indicates that the concentration of products is greater than what is expected at equilibrium, meaning the reaction will shift to the left (toward reactants) to reach equilibrium. This is also true.

- **Statement 3**: Qp < Kp
- This indicates that the concentration of products is less than what is expected at equilibrium, meaning the reaction will shift to the right (toward products) to reach equilibrium. This statement is also true.

- **Statement 4**: Kp = Qp = 1
- This statement is true if at equilibrium, the ratio of the products to reactants yields a value of 1. This can occur under specific conditions where the partial pressures of products and reactants are equal.

3. **Conclusion**:
- All four statements are correct based on the definitions and relationships of Kp and Qp.

### Final Answer:
All of the statements provided are correct.