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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 · Q1 of 120

Geo-Scientist Prelims 2021 Chemistry Q1: The number of radial nodes for 2s, 3p and 3d orbitals, respectively…

QuestionAtomic structure / nodes

The number of radial nodes for 2s, 3p and 3d orbitals, respectively are:

  1. (a) 2, 1, 0
  2. (b) 2, 1, 1
  3. (c) 1, 0, 0
  4. (d) 1, 1, 0

Answer: (d) 1, 1, 0

Radial nodes = n − l − 1. 2s: 2 − 0 − 1 = 1. 3p: 3 − 1 − 1 = 1. 3d: 3 − 2 − 1 = 0. So 1, 1, 0 → (d). Remember: angular nodes = l; total nodes = n − 1.

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