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Indian Forest Service (Mains)

Chemistry optional

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

Paper I covers physical and inorganic chemistry.

Indian Forest Service (Mains), Chemistry optional · 2016 · Paper I

Q2(a)(iii). Bond order of NO and NO⁺; magnetic behaviour

Question

Explain the following: The bond order of NO is lower than that of NO⁺. Comment on their magnetic behaviour.

Answer in brief

NO has one antibonding π*₂ₚ electron: b.o. 2.5, paramagnetic. NO⁺ has lost it: b.o. 3, diamagnetic.

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Topic notes: molecular orbital theory: LCAO, MO diagrams of N₂, O₂, CO, NO, CN⁻ and HF, bond order and magnetism, with every Civil Services, IFoS and Geo-Scientist PYQ →

Coversunpaired electronnitrosonium ion

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