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Question

Of the following reactions, the reaction with the largest equilibrium constant is:

(i) AB; ΔGo=250 kJmol1
(ii) D E; ΔGo=100 kJmol1
(iii) F G; ΔGo=150 kJmol1
(iv) MN; ΔGo=150 kJmol1

A
(i)
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B
(ii)
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C
(iii)
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D
(iv)
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Solution

The correct option is C (iii)
ΔG=RT lnKc

Based on the above equation equilibrium constant is inversely proportional to Gibb's free energy because of the negative sign.
So as Gibb's free energy is more equilibrium constant will also be less.

So, the FG has the largest equilibrium constant.

Hence option C is correct.

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