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Chemical Kinetics
Question
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Which one of the following statements is not correct?

  • Catalyst does not initiate any reaction

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

  • Enzymes catalyse mainly bio-chemical reactions

  • Coenzymes increase the catalytic activity of enzyme

Answer

B.

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

A catalyst decreases activation energies of both the forward and backward reaction by the same amount, therefore, it speeds up both forward and backward reaction by the same rate. The equilibrium constant is therefore not affected by the catalyst at a given temperature.

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Define activation energy of a reaction.