UPSC Combined Geo-Scientist
Chemist
- 3 descriptive papers
- 200 marks each
- 3 h per paper
Mains Paper III covers analytical and organic chemistry.
All years
Pages 1 and 2 of 22 
Pages 3 and 4 of 22
Pages 5 and 6 of 22 Pages 7 and 8 of 22 Pages 9 and 10 of 22 Pages 11 and 12 of 22 Pages 13 and 14 of 22 Pages 15 and 16 of 22 Pages 17 and 18 of 22 Pages 19 and 20 of 22 Pages 21 and 22 of 22 
Mains Paper III, analytical and organic chemistry
Solution, 2016
UPSC Combined Geo-Scientist, Stage II (Mains). 22 pages. Questions 1, 2, 3, 5, 6, 7, 9, 10, 11 and 12 are answered.
Every question of 2016, one page each50 parts in 12 questions, with the question as text and the key points of its answer
Question 1 40 marks
- 1(a)Temperature and neutrality4 marks
- 1(b)Glass-electrode errors4 marks
- 1(c)Solid-phase extraction4 marks
- 1(d)Density of silver4 marks
- 1(e)Auxiliary complexing agent4 marks
- 1(f)Butyric-acid extraction4 marks
- 1(g)DMG reagent requirement4 marks
- 1(h)HPLC and GLC4 marks
- 1(i)AAS background correction4 marks
- 1(j)Solubility product from potentials4 marks
Question 2 15 marks
Question 3 15 marks
Question 4 15 marks
Question 5 15 marks
Question 6 15 marks
Question 7 40 marks
- 7(a)Acidity and hybridisation4 marks
- 7(b)Dichlorocarbene addition4 marks
- 7(c)Grignard addition to a keto ester4 marks
- 7(d)Dipole moment of cyclopropenone4 marks
- 7(e)Cannizzaro reaction4 marks
- 7(f)Frontier orbital nodes4 marks
- 7(g)Keto–enol claim: correction4 marks
- 7(h)Hofmann rearrangement and oxidation4 marks
- 7(i)Carbonyl stretching order4 marks
- 7(j)Carbon count from isotope peaks4 marks
Question 8 15 marks
Question 9 15 marks
Question 10 15 marks
Question 11 15 marks
Part of VKC Basic
Read the full model answer to every question of this paper with VKC Basic
VKC Basic (₹999 for 6 months) opens every solved answer, the notes, the handbook and the daily answer archive. Every Mains test series includes it.
Model answer pages open with the VKC plan.
Model answer pages open with the VKC plan.
Model answer pages open with the VKC plan.
Model answer pages open with the VKC plan.
Model answer pages open with the VKC plan.
Model answer pages open with the VKC plan.
Model answer pages open with the VKC plan.
Model answer pages open with the VKC plan.
Model answer pages open with the VKC plan.
Printed copy and Kindle
UPSC Combined Geo-Scientist (Main) Chemistry Paper III: Model Answers 2021 to 2025
The book has all five years of Paper III in one volume, with all ten questions of every paper answered, the question printed above each answer, a time plan for each paper, the topic-wise weightage of marks and a topic-wise index.