UPSC Combined Geo-Scientist
Chemist
- 3 descriptive papers
- 200 marks each
- 3 h per paper
Mains Paper II covers physical chemistry.
All years
Page 1 of 8 
Page 2 of 8 
Page 3 of 8 
Page 4 of 8 
Page 5 of 8 
Page 6 of 8 
Page 7 of 8 
Page 8 of 8
Mains Paper II, physical chemistry
Question paper, 2020
UPSC Combined Geo-Scientist, Stage II (Mains). 8 pages, as issued by UPSC.
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