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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 · 2018 · Mains Paper I

Q4(b). Relative absorption intensities

Question

Arrange the following metal compounds in the increasing order of their molar extinction coefficient values. Explain the reasons. KMnO₄, [Co(NH₃)₆]²⁺, [MnBr₄]²⁻ and [CoCl₄]²⁻.

Answer in brief

The usual qualitative order is [MnBr₄]²⁻<[Co(NH₃)₆]²⁺<[CoCl₄]²⁻<MnO₄⁻.

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CoversRelative absorption intensitiesSelection rules

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