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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 · 2016 · Paper I

Q5(d)(i). Shapes of the d orbitals

Question

Draw neat diagrams of the shapes of d-orbitals.

Answer in brief

Five d orbitals (l=2). Four are four-lobed: dxy, dyz, dxz with lobes between the axes, dx²-y² with lobes along x and y. dz² has two lobes along z and a torus (ring) in the xy plane. Each has two angular nodes; lobe signs alternate.

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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 →

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