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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 · Q6 of 120

Geo-Scientist Prelims 2022 Chemistry Q6: Which one of the following represents the correct order of size…

QuestionPeriodic properties / ionic radius

Which one of the following represents the correct order of size among O²⁻, F⁻, Na⁺ and Mg²⁺ isoelectronic ions?

  1. (a) O²⁻ < F⁻ < Na⁺ < Mg²⁺
  2. (b) Mg²⁺ < Na⁺ < F⁻ < O²⁻
  3. (c) Mg²⁺ < Na⁺ < O²⁻ < F⁻
  4. (d) O²⁻ < F⁻ < Mg²⁺ < Na⁺

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