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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 · Q21 of 120

Geo-Scientist Prelims 2025 Chemistry Q21: Doping NiO with Li₂O in presence of air/O₂ increases the electrical…

QuestionSolid state / controlled-valency semiconductors

Doping NiO with Li₂O in presence of air/O₂ increases the electrical conductivity due to :

  1. (a) Formation of F centres in the NiO lattice
  2. (b) Formation of a Schottky defect in the NiO lattice
  3. (c) Formation of excess holes in the NiO lattice
  4. (d) Formation of a Frenkel defect in the NiO lattice

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