Indian Forest Service (Mains)
Chemistry optional
- 2 papers
- 200 marks each
- 3 h per paper
Paper II covers organic chemistry and spectroscopy.
All topics
Paper II, organic chemistry and spectroscopy
Physical chemistry of polymers: every question, 2021 to 2025
7 parts worth 40 marks have been set on this unit in UPSC IFoS Chemistry Paper II from 2021 to 2025. Each one opens on its own page with the question, the answer in brief and the key points.
Syllabus
Polymer solutions and their thermodynamic properties; number and weight average molecular weights of polymers. Determination of molecular weights by sedimentation, light scattering, osmotic pressure, viscosity, end group analysis methods.
Notes: Polymers: polymerisation, Ziegler–Natta and molar mass (full notes) · short notes
2025
- Q6(c)(i) Number- and weight-average molar masses10 marks Question only
2024
- Q5(a) Weight-average molecular mass5 marks Answered
2023
- Q7(d) Why polymers have average molar masses5 marks Answered
- Q8(d) Average repeat-unit mass of a terpolymer5 marks Question only
2022
- Q6(b) Polymer end-group analysis5 marks Question only
2021
- Q6(b)(ii) End-group content of polystyrene5 marks Answered
- Q6(e) Acid equivalent of nylon-6,65 marks Answered