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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 · 2022 · Paper II, Chemistry · Q21 of 120

Geo-Scientist Prelims 2022 Chemistry Q21: Consider the following statements regarding defects in crystals :

QuestionSolid state / crystal defects

Consider the following statements regarding defects in crystals :

  1. Schottky defect occurs in highly ionic compounds where positive and negative ions are of similar size with high coordination number.
  2. Frenkel defect is found in ionic crystal having low coordination number and large difference in size between the positive and negative ions.

Which of the statements given above is/are correct?

  1. (a) 1 only
  2. (b) 2 only
  3. (c) Both 1 and 2
  4. (d) Neither 1 nor 2

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