Chemical and Ionic Equilibrium - Result Question 57

####1. The incorrect match in the following is (2019 Main, 12 April II)

(a) ΔG<0,K>1

(b) ΔG=0,K=1

(c) ΔG>0,K<1

(d) ΔG<0,K<1

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Answer:

Correct Answer: 1. (d)

Solution:

  1. The incorrect match is ΔG<0,K<1.

For an ideal gas ΔG=RTlnK.

lnK=ΔGRT and K=eΔG/RT

The above equation is helpful in predicting the spontaneity of the reaction. e.g.

(i) If ΔG<0,ΔG/RT=+ ve and eΔG/RT>1 and hence, K>1. It means that the reaction occur spontaneously in the forward direction or products predominate over reactants.

(ii) If ΔG>0;ΔG/RT= ve and Extra open brace or missing close brace and hence, K<1. It means that the reaction is non-spontaneous in forward direction (i.e. product side) but spontaneous in reverse direction (i.e. reactants predominate over products or the reaction occurs rarely).

(iii) When K=1, then ΔG=0. This situation generally occur at equilibrium.



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