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Indian Forest Service (Mains)

Chemistry optional

  • 2 papers
  • 200 marks each
  • 3 h per paper

Paper I covers physical and inorganic chemistry.

Indian Forest Service (Mains), Chemistry optional · 2022 · Paper I

Q2(a). Nodes in hydrogen 3p orbitals

Question

Find the radial and angular nodes in the hydrogen orbitals ψ₃pz(r, θ, φ) and ψ₃px(r, θ, φ).

Answer in brief

Both orbitals have one radial node at r = 6a₀; the angular node is the xy plane for 3pz and the yz plane for 3px.

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Topic notes: the hydrogen atom: Schrödinger equation in spherical coordinates, quantum numbers, radial distribution, nodes and orbital shapes, with every Civil Services, IFoS and Geo-Scientist PYQ →

Coversradial nodesangular nodes3p orbitalhydrogen atom wavefunctionnodal plane

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