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 37 
Pages 3 and 4 of 37 
Pages 5 and 6 of 37 
Pages 7 and 8 of 37 
Pages 9 and 10 of 37 
Pages 11 and 12 of 37 
Pages 13 and 14 of 37 
Pages 15 and 16 of 37 
Pages 17 and 18 of 37 Pages 19 and 20 of 37 Pages 21 and 22 of 37 Pages 23 and 24 of 37 Pages 25 and 26 of 37 Pages 27 and 28 of 37 Pages 29 and 30 of 37 Pages 31 and 32 of 37 Pages 33 and 34 of 37 Pages 35 and 36 of 37 Page 37 of 37 
Mains Paper II, physical chemistry
Solution, 2024
UPSC Combined Geo-Scientist, Stage II (Mains). 37 pages. Questions 1, 2, 3, 4, 5, 8, 9, 13, 14 and 15 are answered.
Every question of 2024, one page each42 parts in 15 questions, with the question as text and the key points of its answer
Question 1 80 marks
- 1(a)Volume and critical temperature of two van der Waals gases5 marks
- 1(b)Second virial coefficient A₂ and the Boyle temperature5 marks
- 1(c)Conductors, semiconductors and insulators: band picture5 marks
- 1(d)Cubic and tetragonal Bravais lattices5 marks
- 1(e)Chemical potential and its change with temperature5 marks
- 1(f)Relation between Kp, Kc and Kx5 marks
- 1(g)Rate constant in dm³ mol⁻¹ s⁻¹5 marks
- 1(h)BET equation and its terms5 marks
- 1(i)Zinc–copper cell from two half-reactions5 marks
- 1(j)Alkaline (sodium) error of the glass electrode5 marks
- 1(k)Commutator of position and d/dx5 marks
- 1(l)Meaning and dimensions of |Ψ(x)|²5 marks
- 1(m)Raman effect against fluorescence and phosphorescence5 marks
- 1(n)H₂: no IR or microwave spectrum, but Raman active5 marks
- 1(o)Fluorescence rate constant of tryptophan5 marks
- 1(p)Why 511 nm light dissociates Br₂ but not H₂5 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.
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 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.