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UPSC Combined Geo-Scientist

Chemist

  • 3 descriptive papers
  • 200 marks each
  • 3 h per paper

Mains Paper I covers inorganic chemistry.

UPSC Combined Geo-Scientist, Mains · 2023 · Mains Paper I

Q4(b). Spectrochemical and nephelauxetic series

Question

Differentiate between spectrochemical series and nephelauxetic series.

Answer in brief

The spectrochemical series ranks ligands by Δ. The nephelauxetic series ranks their reduction of interelectronic repulsion, measured by β = B(complex)/B(free ion).

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Topic notes: crystal field theory, with every Civil Services, IFoS and Geo-Scientist PYQ →

Coversspectrochemical seriesnephelauxetic seriesRacah parameter Bnephelauxetic ratio βligand field strength

All parts of Question 4