Which of the following statements is incorrect?

  • A

    Mercurous ion exists as $Hg^+$

  • B

    Mercurous ion is diamagnetic and exists as dimer $Hg_2^{2+}$

  • C

    Mercurous ion is colourless

  • D

    There is a metallic bond between two $Hg^+$ ions

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