What will be the effect of addition of catalyst at room temperature?
Correct answer: B. Activation energy will decrease
- A. The equilibrium constant will increase
- B. Activation energy will decrease
- C. Kf and Kb will increase to the same extent
- D. Equilibrium composition will change
Explanation
The correct answer is that the activation energy will decrease. A catalyst provides an alternative reaction pathway with a lower activation energy, thus increasing the rate of both the forward and reverse reactions. However, it does not change the equilibrium constant or the equilibrium composition of the reaction. The equilibrium constant is determined by the relative energies of the reactants and products, which remain unchanged by a catalyst. Therefore, options stating changes to the equilibrium constant or composition are incorrect.
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About Chemical Equilibrium
Reversible reactions reach dynamic equilibrium when forward and reverse rates become equal, and Le Chatelier's principle predicts the effect of changing concentration, pressure or temperature. The chapter also covers solubility product, the common ion effect, buffer action and the conditions used in Haber's process, with equilibrium shifts distinguished from changes in the equilibrium constant.
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