UPSC Combined Geo-Scientist, Mains · 2026 · Mains Paper III
Q2(b). Spectrophotometric determination of Fe²⁺ with 1,10-phenanthroline
Question
(i) Why is quantitative analysis of Fe²⁺ by spectrophotometric method drastically improved by complexation with 1,10-phenanthroline? What analytical parameters are improved? (ii) How will you validate the above method of analysis?
Model answer
The free solution for 2026 answers the questions picked in its time plan. Question 2 is answered in full in the Book Edition of the 2026 solutions of Geo-Scientist Chemistry Paper III.
Coverschromogenic reagents, method validationSpectrophotometric determination of Fe²⁺ with 110-phenanthroline
All parts of Question 2
- 2(a) Identify the metal from three XRD peaks15 marks
- 2(b) Spectrophotometric determination of Fe²⁺ with 1,10-phenanthroline10 marks
- 2(c) Dating a geological deposit by ICP-MS5 marks