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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 · 2026 · Paper II, Chemistry · Q19 of 120

Geo-Scientist Prelims 2026 Chemistry Q19: Consider the following information available for an ionic binary…

QuestionIonic solids / Born–Landé equation

Consider the following information available for an ionic binary compound :

  1. Madelung Constant
  2. Interionic distance
  3. Charges of the anions and cations
  4. Ionic radii of anions and cations

Which of the information given above is/are required to estimate lattice energy using Born-Landé equation ?

  1. (a) 3 only
  2. (b) 1 and 2 only
  3. (c) 1, 2 and 3 only
  4. (d) 1, 2, 3 and 4

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