UPSC Combined Geo-Scientist, Mains · 2026 · Mains Paper I
Q5(c). E^° of MnO₄⁻/Mn²⁺ by potentiometric titration
Question
How is standard electrode potential (E^°) of Mn⁷⁺/Mn²⁺ determined experimentally through potentiometric titration of standard KMnO₄ versus Mohr's salt solution?
Model answer
The free solution for 2026 answers the questions picked in its time plan. Question 5 is answered in full in the Book Edition of the 2026 solutions of Geo-Scientist Chemistry Paper I.
Coverstitration of Mohr's salt with KMnO₄E^° of MnO₄⁻/Mn²⁺ by potentiometric titration
All parts of Question 5
- 5(a) Colours of TcO₄⁻, MnO₄⁻ and MnO₄²⁻10 marks
- 5(b) Gravimetric estimation of nickel (g L⁻¹)10 marks
- 5(c) E^° of MnO₄⁻/Mn²⁺ by potentiometric titration10 marks