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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 · 2021 · Paper II, Chemistry · Q7 of 120

Geo-Scientist Prelims 2021 Chemistry Q7: 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 K⁺, S²⁻, Cl⁻ and Ca²⁺?

  1. (a) Ca²⁺ > K⁺ > Cl⁻ > S²⁻
  2. (b) S²⁻ > Cl⁻ > K⁺ > Ca²⁺
  3. (c) Cl⁻ > S²⁻ > K⁺ > Ca²⁺
  4. (d) K⁺ > Ca²⁺ > S²⁻ > Cl⁻

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