Which of the following statements are correct about $Zn,\,Cd$ and $Hg$ ?

$(I)$ they exhibit high enthalpies of atomisation as the $d-$ subshell is full

$(II)$ $zn$ and $Cd$ do not show variable oxidation states while $Hg$ shows $+ I$ and $+ II$

$(III)$ Compound of $Zn,\,Cd$ and $Hg$, are paramagnetic in nature

$(IV)$ $Zn,\,Cd$ and $Hg$ are called soft metals

  • A

    $I,\,II,\,III$

  • B

    $I,\,III$

  • C

    $II,\,IV$

  • D

    $IV$ only

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