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NEET 2023 Phase 1 · ChemistryArrheniusPrevious Year Question

Which one of the following statements is \textbf{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) The value of equilibrium constant is changed in the presence of a catalyst \textbf{Solution:} A catalyst lowers the activation energy of both the forward and the backward reactions by the same amount.

  1. A.Catalyst does not initiate any reaction
  2. B.The value of equilibrium constant is changed in the presence of a catalyst in the reaction at equilibrium✓
  3. C.Enzymes catalyse mainly bio-chemical reactions
  4. 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) The value of equilibrium constant is changed in the presence of a catalyst \textbf{Solution:} A catalyst lowers the activation energy of both the forward and the backward reactions by the same amount. It therefore speeds up the attainment of equilibrium but does \textbf{not} change the value of the equilibrium constant . Hence statement (B) is incorrect. The other statements are correct: a catalyst cannot initiate a reaction (it only changes the rate of a feasible one), enzymes are biological catalysts for bio-chemical reactions, and coenzymes enhance enzyme activity.

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