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UPSC Combined Geo-Scientist

Chemist

  • 2 objective papers
  • 120 questions each
  • 2 h per paper
  • 100 + 300 marks

Prelims Paper II covers chemistry.

UPSC Combined Geo-Scientist, Prelims · 2025 · Paper II, Chemistry · Q18 of 120

Geo-Scientist Prelims 2025 Chemistry Q18: A salt with the stoichiometry AB₂ where r(A⁴⁺) = 63 pm and r(B²⁻) =…

QuestionSolid state / radius ratio

A salt with the stoichiometry AB₂ where r(A⁴⁺) = 63 pm and r(B²⁻) = 140 pm adopts :

  1. (a) Rutile structure
  2. (b) Rock salt structure
  3. (c) Fluorite structure
  4. (d) Zinc Blende

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