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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 · 2021 · Mains Paper I

Q5(a). Jahn-Teller structure of hexaaquachromium(II)

Question

Bearing in mind the Jahn-Teller effect, predict the structure of [Cr(H₂O)₆]²⁺.

Answer in brief

High-spin d⁴ [Cr(H₂O)₆]²⁺ is a Jahn-Teller-distorted octahedron, usually represented with two longer axial and four shorter equatorial Cr-O bonds.

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

CoversJahn-Teller effecthexaaquachromium(II)tetragonal distortionhigh-spin d4crystal field theory

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