UPSC Combined Geo-Scientist
Chemist
- 3 descriptive papers
- 200 marks each
- 3 h per paper
Mains Paper II covers physical chemistry.
All years
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Mains Paper II, physical chemistry
Question paper, 2022
UPSC Combined Geo-Scientist, Stage II (Mains). 6 pages, as issued by UPSC.
Every question of 2022, one page each39 parts in 15 questions, with the question as text and the key points of its answer
Question 1 80 marks
- 1(a)Postulates of kinetic theory and the two that fail5 marks
- 1(b)Boyle temperature of oxygen as a van der Waals gas5 marks
- 1(c)Temperature coefficient of conductivity: metal and semiconductor5 marks
- 1(d)Why KCl diffracts like a simple cubic lattice5 marks
- 1(e)Reversal of HCl + NH₃ ⇌ NH₄Cl with temperature5 marks
- 1(f)ΔG for compressing a real gas, from fugacities5 marks
- 1(g)Half-life of a second-order reaction5 marks
- 1(h)Brownian movement and Tyndall effect: why only colloids5 marks
- 1(i)Nernst equation for the redox electrode Pt | Cr⁶⁺, Cr³⁺5 marks
- 1(j)Same electrode positive or negative5 marks
- 1(k)Energy uncertainty of an excited state5 marks
- 1(l)Eigenvalues of a Hermitian operator are real5 marks
- 1(m)Rotational constants of ¹⁴N¹⁶O and ¹⁵N¹⁶O5 marks
- 1(n)Photon–molecule interaction in rotating HCl5 marks
- 1(o)Why radiative transitions are drawn vertical5 marks
- 1(p)Energy of one einstein at 600 nm and 300 nm5 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