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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 · 2022 · Paper II, Chemistry · Q23 of 120

Geo-Scientist Prelims 2022 Chemistry Q23: Which one of the following is the correct electronic configuration…

QuestionChemical bonding / MO theory

Which one of the following is the correct electronic configuration of O₂²⁻?

  1. (a) 1σ_g² 1σ_u² 2σ_g² 1π_u⁴ 1π_g⁴
  2. (b) 1σ_g² 1σ_u² 1π_u⁴ 2σ_g² 1π_g⁴
  3. (c) 1σ_g² 1σ_u² 1π_u⁴ 1π_g⁴ 2σ_g²
  4. (d) 1σ_u² 1σ_g² 2σ_g² 1π_u⁴ 1π_g⁴

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