Which of the comparison regarding $Zn,\,Cd,\,Hg$ is/are incorrect ?

$(I)$ $ZnCl_2$ is ionic whereas $CdCl_2$ and $HgCl_2$ are covalent

$(II)$ $Zn$ and $Cd$ dissolves in dilute acid $(HCl)$ liberating $H_2$ but $Hg$ can not

$(III)$ $Zn$ and $Cd$ forming with ppt. of $Zn(OH)_2$ and $Cd(OH)_2$ but $Hg$ forms coloured ppt. of

$(IV)$ all from $A_2^{2+}$ type ion

  • A

    only $III$

  • B

    $I, III, IV$

  • C

    $I$ and $III$

  • D

    all of these

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(Given atomic number of $\mathrm{Mn}$ is $25$ )

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