UPSC Combined Geo-Scientist, Mains · 2026 · Mains Paper II
Q11(a). K_c from the standard free-energy change
Question
For a solution phase reaction: A(aq)+B(aq)⇌ D(aq); derive the expression for K_c in terms of the standard free energy change. (i) What would be the standard state value? (ii) What would be the unit of K_c? (iii) What factors can influence the value of K_c?
Model answer
The free solution for 2026 answers the questions picked in its time plan. Question 11 is answered in full in the Book Edition of the 2026 solutions of Geo-Scientist Chemistry Paper II.
CoversΔᵣG^° and KK_c from the standard free-energy change
All parts of Question 11
- 11(a) K_c from the standard free-energy change15 marks
- 11(b) ΔᵣG^°(P) and ΔᵣG^°(C)5 marks