Test: Applications of Equilibrium Constants (July 21) - NEET MCQ

The correct statement about equilibrium constants is:

     3. Equilibrium constants are different for the same reaction at different temperatures.

Here's a brief explanation of why the other statements are incorrect:

1. The equilibrium constant does not depend on the initial concentrations of reactants and products. It only depends on the ratio of the concentrations of products to reactants at equilibrium.

2. A catalyst does not change the value of the equilibrium constant. A catalyst only speeds up the rate at which equilibrium is reached.

4. Changes in concentration and pressure do not affect the equilibrium constant. However, changes in temperature do affect the equilibrium constant.

The correct answer is:

a) By comparing Q to K, where Q > K indicates a backward reaction, and Q < K indicates a forward reaction.

Explanation:

• The reaction quotient Q is calculated using the concentrations of the reactants and products at any point during the reaction.
• The equilibrium constant K is the value of Q when the reaction is at equilibrium.
• If Q<K, the reaction will proceed in the forward direction to reach equilibrium (products are favored).
• If Q>K, the reaction will proceed in the reverse direction to reach equilibrium (reactants are favored).
• If Q=K, the reaction is at equilibrium, and there is no net change in the concentration of reactants and products.