Indian Forest Service (Mains), Chemistry optional · 2022 · Paper I
Q7(a). Adsorption isotherms and BET theory
Question
Draw various types of adsorption isotherm curves involved in monolayer and multilayer formation. Explain these curves based on Brunauer–Emmett–Teller theory.
Model answer
The free solution for 2022 answers questions 1, 2, 4, 5 and 6, the ones picked in its time plan. Question 7 is answered in full in the IFoS Chemistry Paper I, 2021 to 2025 book, with every part of every paper.
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UPSC Indian Forest Service (Main) Chemistry Paper I: Model Answers 2021 to 2025
- All eight questions of each paper, with the question printed above its answer
- Physical chemistry numericals worked with units; inorganic structures drawn
- Topic-wise weightage and a topic-wise index
CoversBET theoryadsorption isotherm typesmultilayer adsorptionBrunauer classificationsurface area
All parts of Question 7
- 7(a) Adsorption isotherms and BET theory10 marks
- 7(b)(i) Square-planar substitution and trans effect10 marks
- 7(b)(ii) Fluxional molecules and variable-temperature NMR5 marks
- 7(c)(i) Lanthanide oxidation states8 marks
- 7(c)(ii) Sharp weak f–f spectra7 marks