UPSC Combined Geo-Scientist, Mains · 2022 · Mains Paper III
Q3(b). Lead in petrol: direct and indirect methods
Question
Describe the direct and indirect methods for the estimation of lead in petrol.
Model answer
The free solution for 2022 answers questions 1, 4, 5, 6, 7 and 10, the ones picked in its time plan. Question 3 is answered in full in the Geo-Scientist Chemistry Paper III, 2021 to 2025 book, with every part of every paper.
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UPSC Combined Geo-Scientist (Main) Chemistry Paper III: Model Answers 2021 to 2025
- All ten questions of each paper, with the question printed above its answer
- Instruments drawn as labelled diagrams, numericals worked with units
- Topic-wise weightage and a topic-wise index
Coverslead in petroltetraethyl leadAASX-ray fluorescenceEDTA titration
All parts of Question 3
- 3(a) Density of silver from its powder XRD pattern15 marks
- 3(b) Lead in petrol: direct and indirect methods10 marks
- 3(c) Fuel and oxidant for two flames in AAS5 marks