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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 · 2022 · Mains Paper I

Q4(c). Square-planar tetracyanonickelate(II)

Question

Draw and explain the crystal field splitting energy diagram of [Ni(CN)₄]²⁻ complex.

Answer in brief

[Ni(CN)₄]²⁻ is square-planar, low-spin d⁸ and diamagnetic. Four lower d orbitals are doubly occupied; the strongly antibonding dx²−y² level is empty.

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As written for the answer booklet: the diagram carries the working, the lines stay short. Read here only; it is not offered as a download.

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

Coverssquare planar crystal field splitting[Ni(CN)4]2-d8 low spindsp2diamagnetic complex

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