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Coordination Compounds — Chemistry STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 ScienceChemistryCoordination Compounds1 Mark
MCQ
The colour of a complex compound is due to:
  • A
    Promotion of 3d-electrons of the central atom/ion to 4s-orbital.
  • B
    Promotion of 3d-electrons of the central atom/ion to 4p-orbitals.
  • C
    Promotion of 3d-electrons of the central atom/ion to d-orbitals.
  • D
    Promotion of 4s-electrons of the central atom/ion to 4p-orbitals.
✓

Answer

  1. Promotion of 3d-electrons of the central atom/ion to d-orbitals.

Explanation:

The colour of a complex compound is due to promotion of 3d-electrons of the central atom/ion to d-orbitals..

The colour of the complex compound is due to d−d electronic transition.The d-orbitals of a free transition metal atom or ion are degenerate (all have the same energy.)

When transition metals form coordination complexes, the d-orbitals of the metal interact with the electron cloud of the ligands in such a manner that the d-orbitals become non-degenerate (not all having the same energy).

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