The following are some statements about equilibrium constant
(A) The value of K is affected by temperature
(B) The cquilibrium constant gives idea about the extent of completion of reaction
(C) The cquilibrium constant is affected by volume and pressure
the correct combination is

Options

A. A and B
B. B and C
C. C and A
D. All

Answer

To determine the correct combination of statements about the equilibrium constant, let's analyze each statement step by step.

### Step 1: Analyze Statement (A)
**Statement (A): The value of K is affected by temperature.**

The equilibrium constant (K) is indeed dependent on temperature. According to the Arrhenius equation, the rate constants for the forward and backward reactions change with temperature, which in turn affects the equilibrium constant. Therefore, this statement is **correct**.

### Step 2: Analyze Statement (B)
**Statement (B): The equilibrium constant gives an idea about the extent of completion of the reaction.**

The equilibrium constant (K) provides a measure of the ratio of the concentrations of products to reactants at equilibrium. A larger K value indicates that the products are favored at equilibrium, suggesting that the reaction has gone further toward completion. Conversely, a smaller K value indicates that reactants are favored. Thus, this statement is also **correct**.

### Step 3: Analyze Statement (C)
**Statement (C): The equilibrium constant is affected by volume and pressure.**

While changes in volume and pressure can shift the position of equilibrium (according to Le Chatelier's principle), they do not affect the value of the equilibrium constant itself. The equilibrium constant remains constant at a given temperature, regardless of changes in volume or pressure. Therefore, this statement is **incorrect**.

### Conclusion
Based on the analysis:
- Statement (A) is correct.
- Statement (B) is correct.
- Statement (C) is incorrect.

Thus, the correct combination of statements is **A and B**.

### Final Answer
The correct combination is **A and B**.

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