UPSC Combined Geo-Scientist
Chemist
- 3 descriptive papers
- 200 marks each
- 3 h per paper
Mains Paper I covers inorganic chemistry.
All years
Pages 1 and 2 of 29 
Pages 3 and 4 of 29 
Pages 5 and 6 of 29 
Pages 7 and 8 of 29 
Pages 9 and 10 of 29 
Pages 11 and 12 of 29
Pages 13 and 14 of 29 Pages 15 and 16 of 29 Pages 17 and 18 of 29 Pages 19 and 20 of 29 Pages 21 and 22 of 29 Pages 23 and 24 of 29 Pages 25 and 26 of 29 Pages 27 and 28 of 29 Page 29 of 29 
Mains Paper I, inorganic chemistry
Solution, 2021
UPSC Combined Geo-Scientist, Stage II (Mains). 29 pages. Questions 1, 2, 5, 6, 9 and 11 are answered.
Every question of 2021, one page each40 parts in 11 questions, with the question as text and the key points of its answer
Question 1 50 marks
- 1(a)Quartz-type aluminophosphate5 marks
- 1(b)Fifth ammonia ligand on copper(II)5 marks
- 1(c)Why hydride and phosphine are strong-field ligands5 marks
- 1(d)Indicator choice for weak-acid titration5 marks
- 1(e)Postprecipitation versus coprecipitation5 marks
- 1(f)Role of mercuric chloride in iron titration5 marks
- 1(g)Chelators in complexometric titrations5 marks
- 1(h)Carbonyl C-O bond strengths5 marks
- 1(i)Balancing nuclear reactions5 marks
- 1(j)Orbital contribution to magnetic moments5 marks
Question 2 30 marks
Question 3 30 marks
Question 4 30 marks
Question 5 30 marks
Question 6 30 marks
Question 7 30 marks
Question 8 30 marks
Question 9 30 marks
Question 10 30 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 I: Model Answers 2021 to 2025
The book has all five years of Paper I in one volume, with all eleven 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.