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UPSC Combined Geo-Scientist

Chemist

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

Mains Paper II covers physical chemistry.

UPSC Combined Geo-Scientist, Mains · 2016 · Mains Paper II

Q12(b)(ii). Carbon dioxide normal modes

Question

Sketch the normal modes of CO₂ and explain which are Raman-active and which are IR-active.

Answer in brief

Four normal coordinates: symmetric stretch is Raman-active; antisymmetric stretch and the two degenerate bends are IR-active.

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The full model answer

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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CoversCarbon dioxide normal modesIR and Raman selection rules

All parts of Question 12