VKC ScienceChemistry for written exams Telegram

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 · 2019 · Mains Paper I

Q2(d). Radius ratio and coordination

Question

How the concept of radius ratio governs the coordination number of the ions in a compound? Illustrate with suitable examples.

Answer in brief

The radius-ratio model estimates which anion hole can accommodate a cation without destabilising anion contacts.

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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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Read the whole 2019 solution2019 question paper

CoversRadius ratiocoordinationIonic crystals

All parts of Question 2