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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 · 2023 · Paper II, Chemistry · Q9 of 120

Geo-Scientist Prelims 2023 Chemistry Q9: Which one of the following represents the correct order of ionic…

QuestionPeriodic properties / isoelectronic ions

Which one of the following represents the correct order of ionic radii among O²⁻, F⁻, Na⁺, Mg²⁺ and Al³⁺ ?

  1. (a) Al³⁺ > Mg²⁺ > Na⁺ > F⁻ > O²⁻
  2. (b) Na⁺ > Mg²⁺ > Al³⁺ > O²⁻ > F⁻
  3. (c) Na⁺ > F⁻ > Mg²⁺ > O²⁻ > Al³⁺
  4. (d) O²⁻ > F⁻ > Na⁺ > Mg²⁺ > Al³⁺

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