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A chemical reaction is catalyzed by a catalyst X. Hence X:

1. reduces enthalpy of the reaction
2. decreases rate constant of the reaction
3. increases activation energy of the reaction
4. does not affect equilibrium constant of the reaction

Correct answer: does not affect equilibrium constant of the reaction

Solution

A catalyst speeds up a reaction by lowering the activation energy but does not alter the equilibrium constant, as it affects both forward and reverse reactions equally.

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