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 18 
Pages 3 and 4 of 18
Pages 5 and 6 of 18 Pages 7 and 8 of 18 Pages 9 and 10 of 18 Pages 11 and 12 of 18 Pages 13 and 14 of 18 Pages 15 and 16 of 18 Pages 17 and 18 of 18 
Mains Paper III, analytical and organic chemistry
Solution, 2017
UPSC Combined Geo-Scientist, Stage II (Mains). 18 pages. Questions 1, 2, 4, 6, 9 and 10 are answered.
Every question of 2017, one page each44 parts in 10 questions, with the question as text and the key points of its answer
Question 1 40 marks
- 1(a)Copper oxide mixture5 marks
- 1(b)Selective sulfate precipitation5 marks
- 1(c)Solvent effect on aniline basicity5 marks
- 1(d)Fluoride-selective electrode5 marks
- 1(e)Organic solvents in AAS5 marks
- 1(f)Flame ionisation detector5 marks
- 1(g)Proximate analysis by TGA5 marks
- 1(h)ICP-MS dilution calculation5 marks
Question 2 30 marks
Question 3 30 marks
Question 4 30 marks
Question 5 30 marks
Question 6 40 marks
- 6(a)Nitrophenol acidity5 marks
- 6(b)Benzene and cyclooctatetraene orbitals5 marks
- 6(c)Aldehyde electrophilicity5 marks
- 6(d)Carbocation stability5 marks
- 6(e)Steric inhibition of resonance5 marks
- 6(f)Cyclopropenone dipole5 marks
- 6(g)SN1 and aromatic cations5 marks
- 6(h)Exhaustive methylation of piperidine5 marks
Question 7 30 marks
Question 8 30 marks
Question 9 30 marks
Part of VKC Basic
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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.