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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 · 2023 · Mains Paper I

Q3(c). Point defects in crystals

Question

Write a brief note on point defect.

Answer in brief

A point defect is a local imperfection involving an atomic site or its immediate surroundings, such as a vacancy, interstitial or substitutional impurity.

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The full model answer

As written for the answer booklet: the diagram carries the working, the lines stay short. Read here only; it is not offered as a download.

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Topic notes: defects, non-stoichiometry and semiconductors, with every Civil Services, IFoS and Geo-Scientist PYQ →

Coverspoint defectsSchottky defectFrenkel defectF centrevacancy and interstitial

All parts of Question 3