Which of the following statements are correct | vedclass

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(C) Statement $(I)$ is incorrect because $Zn$,$Cd$,and $Hg$ have fully filled $d$-orbitals $(d^{10})$,which leads to weak metallic bonding and consequ

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$II, IV$

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(C) Statement $(I)$ is incorrect because $Zn$,$Cd$,and $Hg$ have fully filled $d$-orbitals $(d^{10})$,which leads to weak metallic bonding and consequently low enthalpies of atomisation.Statement $(II)$ is correct. $Zn$ and $Cd$ exhibit only $+2$ oxidation state,whereas $Hg$ can exhibit $+1$ (as $Hg_2^{2+}$) and $+2$ oxidation states.Statement $(III)$ is incorrect. Since they have a $d^{10}$ configuration,all electrons are paired,making their compounds diamagnetic,not paramagnetic.Statement $(IV)$ is correct. Due to weak metallic bonding resulting from the $d^{10}$ configuration,these elements are relatively soft compared to other transition metals.Therefore,statements $(II)$ and $(IV)$ are correct.

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