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