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 24 
Pages 3 and 4 of 24 
Pages 5 and 6 of 24 
Pages 7 and 8 of 24
Pages 9 and 10 of 24 Pages 11 and 12 of 24 Pages 13 and 14 of 24 Pages 15 and 16 of 24 Pages 17 and 18 of 24 Pages 19 and 20 of 24 Pages 21 and 22 of 24 Pages 23 and 24 of 24 
Mains Paper I, inorganic chemistry
Solution, 2025
UPSC Combined Geo-Scientist, Stage II (Mains). 24 pages. Questions 1, 3, 4, 6, 9 and 10 are answered.
Every question of 2025, one page each36 parts in 11 questions, with the question as text and the key points of its answer
Question 1 50 marks
- 1(a)Defect in silver chloride5 marks
- 1(b)Isomerism in [(NH₃)₅CoONO]Cl₂ and [(NH₃)₅CoNO₂]Cl₂5 marks
- 1(c)Trans effect: Niᴵᴵ, Ptᴵᴵ, Pdᴵᴵ5 marks
- 1(d)Phenolphthalein in dilute and in concentrated alkali5 marks
- 1(e)Solubility product of silver chromate5 marks
- 1(f)Colour change interval of diphenylamine5 marks
- 1(g)Eriochrome Black T and calcium5 marks
- 1(h)Tendency to form metal clusters5 marks
- 1(i)Complete the nuclear equations5 marks
- 1(j)First ionisation enthalpy of 5d elements5 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.
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.