Which one of the following statements is not correct?
Answer: (B) The value of equilibrium constant is changed in the presence of a catalyst in the reaction at equilibrium. \textbf{Answer:} (B) A catalyst does not change the equilibrium constant.
- A.Catalyst does not initiate any reaction
- B.The value of equilibrium constant is changed in the presence of a catalyst in the reaction at equilibrium✓
- C.Enzymes catalyse mainly bio-chemical reactions
- D.Coenzymes increase the catalytic activity of enzyme
Correct Answer
(B) The value of equilibrium constant is changed in the presence of a catalyst in the reaction at equilibrium
Solution & Explanation
\textbf{Answer:} (B) A catalyst does not change the equilibrium constant. \textbf{Solution:} A catalyst lowers the activation energy of the forward and the backward reactions by the same amount, so it speeds up both equally and the reaction reaches equilibrium faster — but the value of the equilibrium constant () at a given temperature is unchanged. Hence statement B is incorrect. The other statements are true: a catalyst only speeds an already-feasible reaction (it does not initiate one), enzymes are biological catalysts for biochemical reactions, and coenzymes (non-protein cofactors) enhance enzyme activity.