UPSC Combined Geo-Scientist, Mains · 2022 · Mains Paper III
Q2(a). Chromium and manganese in steel by spectrophotometry
Question
Describe the method (sample dissolution, chemical reactions and the steps involved) for estimating Cr and Mn in steel spectrophotometrically.
Model answer
The free solution for 2022 answers questions 1, 4, 5, 6, 7 and 10, the ones picked in its time plan. Question 2 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
Coverssimultaneous spectrophotometric determinationchromium in steelmanganese in steelpermanganatedichromatepersulfate oxidation
All parts of Question 2
- 2(a) Chromium and manganese in steel by spectrophotometry15 marks
- 2(b) Resolution, plate number, plate height and a longer column10 marks
- 2(c) Slit width that resolves the sodium D lines5 marks