Identify incorrect statement

  • [JEE MAIN 2013]
  • A

    $Cu_2O$ is colourless

  • B

    Copper $(I)$ compounds are colourless except when colour results from charge transfer

  • C

    Copper $(I)$ compounds are diamagnetic.

  • D

    $Cu_2S$ is black.

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  • [NEET 2019]

Write a note on halide compounds of transition elements.

$Zn$ and $Hg$ belong to the same group, they differ in many of their properties. The property that is shared by both is