The $3d$ metal ions form coloured compounds because the energy corresponding to the following lies in the visible range of the electromagnetic spectrum:

  • A
    Free energy change of complex formation by $3d$ metal ions
  • B
    $d-d$ transitions of $3d$ electrons
  • C
    Heat of hydration of $3d$ metal ions
  • D
    Ionisation energy of $3d$ metal ions

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