A : A catalyst does not alter the equilibrium constant of a reaction
R : A catalyst does not alter the position of chemical equilibrium .

Options

A. If both Assertion & Reason are true and the reason in the corret explanation of the assertion, then mark
B. If both assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark
C. If Assertion is true statement but Reason is false then mark
D. If both Assertion and Reason are false statements , then mark

Answer

To analyze the statements given in the question, we need to evaluate both parts:

**Statement A**: A catalyst does not alter the equilibrium constant of a reaction.
**Statement R**: A catalyst does not alter the position of chemical equilibrium.

### Step-by-Step Solution:

1. **Understanding the Role of a Catalyst**:
- A catalyst is a substance that increases the rate of a chemical reaction without being consumed in the process. It achieves this by lowering the activation energy required for the reaction to proceed.

**Hint**: Recall the definition of a catalyst and its role in chemical reactions.

2. **Effect on Equilibrium Constant**:
- The equilibrium constant (K) of a reaction is determined by the ratio of the concentrations of products to reactants at equilibrium. A catalyst speeds up the rate at which equilibrium is reached but does not change the concentrations of reactants and products at equilibrium.

**Hint**: Remember that K is a function of the concentrations of products and reactants at equilibrium, not the path taken to reach equilibrium.

3. **Position of Chemical Equilibrium**:
- The position of equilibrium refers to the relative concentrations of reactants and products when the reaction has reached a state where the forward and reverse reactions occur at the same rate. A catalyst does not change these concentrations; it merely allows the system to reach this state faster.

**Hint**: Consider how equilibrium is defined and what factors influence it.

4. **Conclusion**:
- Since a catalyst does not change the equilibrium constant (Statement A is true) and does not alter the position of equilibrium (Statement R is also true), both statements are correct. However, Statement A is not explained by Statement R. The catalyst's role is to speed up the reaction without affecting the equilibrium concentrations.

**Hint**: Evaluate the relationship between the two statements critically to determine if one explains the other.

### Final Answer:
Both statements are true, but Statement R does not explain Statement A.