UPSC Combined Geo-Scientist
Chemist
- 3 descriptive papers
- 200 marks each
- 3 h per paper
Mains Paper II covers physical chemistry.
All years
Pages 1 and 2 of 17 
Pages 3 and 4 of 17 
Pages 5 and 6 of 17 
Pages 7 and 8 of 17
Pages 9 and 10 of 17 Pages 11 and 12 of 17 Pages 13 and 14 of 17 Pages 15 and 16 of 17 Page 17 of 17 
Mains Paper II, physical chemistry
Solution, 2020
UPSC Combined Geo-Scientist, Stage II (Mains). 17 pages. Questions 1, 2, 3, 4, 5, 7, 8, 11, 12 and 13 are answered.
Every question of 2020, one page each38 parts in 15 questions, with the question as text and the key points of its answer
Question 1 80 marks
- 1(a)Critical-point inflection5 marks
- 1(b)Boyle and inversion temperatures5 marks
- 1(c)Accuracy at high diffraction angle5 marks
- 1(d)Composition change and non-expansion work5 marks
- 1(e)Van't Hoff plots5 marks
- 1(f)Potassium sulfate activities5 marks
- 1(g)Reaction order and rate constant5 marks
- 1(h)Catalytic rate enhancement5 marks
- 1(i)Electrochemical potential of zinc ions5 marks
- 1(j)Open-circuit emf and equilibrium5 marks
- 1(k)Hermitian operators5 marks
- 1(l)Probabilities of quantum states5 marks
- 1(m)Hydrogen rotational spectra5 marks
- 1(n)Wavelength and the einstein5 marks
- 1(o)Uranyl-sensitised decomposition5 marks
- 1(p)HI photolysis yield5 marks
Question 2 10 marks
Question 3 10 marks
Question 4 10 marks
Question 5 10 marks
Question 6 10 marks
Question 7 10 marks
Question 8 10 marks
Question 9 10 marks
Question 10 10 marks
Question 11 20 marks
Question 12 20 marks
Question 13 20 marks
Question 14 20 marks
Part of VKC Basic
Read the full model answer to every question of this paper with 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.
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UPSC Combined Geo-Scientist (Main) Chemistry Paper II: Model Answers 2021 to 2025
The book has all five years of Paper II in one volume, with all fifteen 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.