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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 · Q19 of 120

Geo-Scientist Prelims 2025 Chemistry Q19: In ZnS crystal lattice, S²⁻ ions form two different close-packed…

QuestionSolid state / ZnS structures

In ZnS crystal lattice, S²⁻ ions form two different close-packed arrays in which Zn²⁺ occupies tetrahedral holes. Two structures adopted by ZnS will be :

  1. (a) Zinc Blende (ccp), Wurtzrite (hcp)
  2. (b) Zinc Blende (ccp), Wurtzrite (bcc)
  3. (c) Zinc Blende (bcc), Wurtzrite (hcp)
  4. (d) Zinc Blende (ccp), Wurtzrite (fcc)

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