For any reversible reaction. If increases concentration of reactants. Then effect on equilibruim constant:

Options

A. Depend's on amount of concentration
B. Unchanged
C. Decreases
D. Increase

Answer

To solve the question regarding the effect of increasing the concentration of reactants on the equilibrium constant, we can follow these steps:

### Step 1: Understand the Concept of Equilibrium Constant
The equilibrium constant (K) for a reversible reaction is a value that expresses the ratio of the concentration of products to the concentration of reactants at equilibrium, raised to the power of their coefficients in the balanced equation. It is given by the formula:
\[ K = \frac{[C]^c}{[A]^a[B]^b} \]
where A and B are reactants and C is the product.

**Hint:** Remember that the equilibrium constant is a ratio that reflects the state of the system at equilibrium, not during the transition.

### Step 2: Apply Le Chatelier's Principle
Le Chatelier's principle states that if a system at equilibrium is subjected to a change in concentration, temperature, or pressure, the system will adjust itself to counteract that change and restore a new equilibrium.

**Hint:** Think of Le Chatelier's principle as the system's way of maintaining balance when disturbed.

### Step 3: Increase Concentration of Reactants
When we increase the concentration of reactants (for example, A in the reaction A + B ⇌ C), the system will respond by shifting the equilibrium position to the right (toward the products) to consume some of the added reactants.

**Hint:** Visualize the reaction shifting to use up the excess reactants to restore equilibrium.

### Step 4: Effect on Equilibrium Constant
Despite the shift in equilibrium position, the equilibrium constant (K) itself remains unchanged. The value of K is only affected by changes in temperature. Therefore, even though the concentrations of reactants and products may change as the system reaches a new equilibrium, the equilibrium constant does not change.

**Hint:** Remember that K is a constant at a given temperature, regardless of concentration changes.

### Conclusion
Thus, the correct answer to the question is that the equilibrium constant remains unchanged even if we increase the concentration of any of the reactants.

**Final Answer:** The equilibrium constant remains unchanged (Option B).

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