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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 · 2024 · Paper II, Chemistry · Q7 of 120

Geo-Scientist Prelims 2024 Chemistry Q7: Which one of the following represents the correct order of ionic…

Questionf-block / lanthanide contraction

Which one of the following represents the correct order of ionic radii among Y³⁺, La³⁺, Eu³⁺ and Lu³⁺?

  1. (a) Y³⁺ < La³⁺ < Eu³⁺ < Lu³⁺
  2. (b) Lu³⁺ < Eu³⁺ < La³⁺ < Y³⁺
  3. (c) Eu³⁺ < La³⁺ < Lu³⁺ < Y³⁺
  4. (d) Lu³⁺ < Y³⁺ < Eu³⁺ < La³⁺

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