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UPSC Combined Geo-Scientist

Chemist

  • 2 objective papers
  • 120 questions each
  • 2 h per paper
  • 100 + 300 marks

Prelims Paper II covers chemistry.

UPSC Combined Geo-Scientist, Prelims · 2020 · Paper II, Chemistry · Q21 of 120

Geo-Scientist Prelims 2020 Chemistry Q21: The complex ions [NiCl₄]²⁻ and [Ni(CN)₄]²⁻ are:

QuestionCoordination / geometry and magnetism

The complex ions [NiCl₄]²⁻ and [Ni(CN)₄]²⁻ are:

  1. (a) Both square planar
  2. (b) Both diamagnetic
  3. (c) Both paramagnetic
  4. (d) Paramagnetic and diamagnetic respectively

Answer: (d) Paramagnetic and diamagnetic respectively

[NiCl₄]²⁻: Cl⁻ weak, sp³ tetrahedral, 2 unpaired e⁻ → paramagnetic. [Ni(CN)₄]²⁻: CN⁻ strong, pairs electrons, dsp² square planar → diamagnetic → (d).

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