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UPSC Combined Geo-Scientist

Chemist

  • 2 objective papers
  • 120 questions each
  • 2 h per paper
  • 100 + 300 marks

Prelims Paper I covers general studies.

UPSC Combined Geo-Scientist, Prelims · 2023 · Paper I, General Studies · Q44 of 120

Geo-Scientist Prelims 2023 General Studies Q44: The radius of the first orbit (n = 1) of a hydrogen atom is 0·529…

QuestionAtomic structure / Bohr model

The radius of the first orbit (n = 1) of a hydrogen atom is 0·529 Å. Then the radius of the second orbit (n = 2) of He⁺ ion will be

  1. (a) 1·058 Å
  2. (b) 2·116 Å
  3. (c) 4·232 Å
  4. (d) 0·529 Å

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