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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 · 2017 · Mains Paper I

Q11(b). Permanganate colour

Question

Aqueous solutions of potassium permanganate exhibit very intense electronic transition at ~530 nm. What is the nature of this transition? Justify your answer.

Answer in brief

The intense visible band is mainly ligand-to-metal charge transfer (LMCT), from oxygen-based occupied orbitals to vacant orbitals with manganese character.

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CoversPermanganate colourCharge-transfer spectroscopy

All parts of Question 11