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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 · 2024 · Mains Paper I

Q2(a)(i). Fluorite and antifluorite

Question

Differentiate between fluorite and antifluorite.

Answer in brief

Fluorite: cations form the fcc array and anions fill all tetrahedral holes. Antifluorite reverses these roles.

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Topic notes: inorganic solids: perovskite, spinel, ReO₃, corundum, high-Tc superconductors and solid-state synthesis, with every Civil Services, IFoS and Geo-Scientist PYQ →

Coversfluorite structureantifluorite structureCaF2Li2Ocoordination number

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