Topic: Law of chemical equilibrium, Kp and Kc· Equilibrium

Which one of the following statements is not correct ?

1. The value of equilibrium constant is changed in the presence of a catalyst in the reaction at equilibrium.

2. Enzymes catalyse mainly bio-chemical reactions.

3. Coenzymes increase the catalytic activity of enzyme.

4. Catalyst does not initiate any reaction.

Doubtly Asked 30 Oct 2026 NEET UG 2017 Practice test neet Save WhatsApp Report

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Answer: 1. The value of equilibrium constant is changed in the presence of a catalyst in the reaction at equilibrium.

Key idea: a catalyst changes the rate but not the position of equilibrium.

A catalyst lowers the activation energy of both forward and backward reactions equally, so the equilibrium constant K is unchanged. Statement 1 is therefore incorrect. The rest are true: enzymes catalyse biochemical reactions, coenzymes enhance enzyme activity, and a catalyst cannot start a reaction that is not thermodynamically feasible.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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Which one of the following statements is not correct ?

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