The correct relationship between free energy change in a reaction and the corresponding equilibrium constant Kc is

(a) ΔG = RT ln Kc 

(b) –ΔG = RT ln Kc

(c) ΔG ° = RT ln Kc 

(d) –ΔG ° = RT ln Kc .

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2 Answers

(d) :  ΔG =  ΔG° + 2.303 RTlogKc
At equilibrium,  ΔG = 0
 ΔG° = –2.303 RTlogKc

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Correct option (b) - ΔG = RT In Kc

Explanation:

Relationship between free energy and equilibrium constant,

 - ΔG = RT In Kc

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