Q3(c). Spin-only magnetic moments
Calculate the magnetic moment values for the following complexes based on the unpaired electrons present: (i) [Fe(NH₃)₆]³⁺ (ii) [CoBr₆]³⁻ and [CuCl₄]²⁻
Model answer
The free solution for 2022 answers questions 1, 2, 4, 7, 8 and 11, the ones picked in its time plan. Question 3 is answered in full in the Geo-Scientist Chemistry Paper I, 2021 to 2025 book, with every part of every paper.
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UPSC Combined Geo-Scientist (Main) Chemistry Paper I: Model Answers 2021 to 2025
- All eleven questions of each paper, with the question printed above its answer
- Titration, gravimetric and nuclear numericals worked with units; structures drawn
- Topic-wise weightage and a topic-wise index
Topic notes: crystal field theory, with every Civil Services, IFoS and Geo-Scientist PYQ →
Coversspin-only magnetic momentunpaired electrons√n(n+2)[CuCl4]2-high spin low spin
All parts of Question 3
- 3(a) Jahn-Teller distortion across d¹–d⁹10 marks
- 3(b) Factors controlling crystal-field splitting10 marks
- 3(c) Spin-only magnetic moments10 marks