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What happens to the value of ΔG of a reaction when a catalyst is added to it?

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in Chemistry – Class 12 by (188k points)
What happens to the value of ΔG of a reaction when a catalyst is added to it?

(a) It increases

(b) It decreases

(c) It remains unchanged

(d) It is undefined on adding a catalyst

I got this question in a national level competition.

The origin of the question is Chemical Kinetics topic in division Chemical Kinetics of Chemistry – Class 12

1 Answer

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Correct answer is (c) It remains unchanged

Easy explanation: Gibbs free energy(ΔG) is a state function, that is, it does not depend on the path taken by the reaction to reach the end product. It only depends on the enthalpy and the entropy of the reaction which in turn depend on the products and reactants of the reaction. Since a catalyst only changes the pathway taken by the reaction, it does not alter the value of ΔG.

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