Which of the comparison regarding Zn, Cd, Hg | vedclass

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(B) Statement $(I)$ is correct: $ZnCl_2$ is predominantly ionic,while $CdCl_2$ and $HgCl_2$ show significant covalent character due to polarization.St

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$I, III, IV$

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(B) Statement $(I)$ is correct: $ZnCl_2$ is predominantly ionic,while $CdCl_2$ and $HgCl_2$ show significant covalent character due to polarization.Statement $(II)$ is correct: $Zn$ and $Cd$ have negative standard reduction potentials and react with dilute $HCl$ to release $H_2$ gas. $Hg$ has a positive reduction potential and does not react with non-oxidizing acids.Statement $(III)$ is incorrect: $Hg^{2+}$ ions react with $OH^-$ to form $HgO$ (yellow/red precipitate),but $Hg_2^{2+}$ (mercurous) forms black $Hg_2O$. The statement is generalized and misleading regarding the specific oxidation states.Statement $(IV)$ is incorrect: While $Hg$ forms the $Hg_2^{2+}$ ion,$Zn$ and $Cd$ do not form stable $M_2^{2+}$ ions under normal conditions.Therefore,statements $(III)$ and $(IV)$ are incorrect.

Property	Metal
$a$. Element with highest second ionization enthalpy $(\Delta_{i} H_2)$	$i$. $Co$
$b$. Element with highest third ionization enthalpy $(\Delta_{i} H_3)$	$ii$. $Cr$
$c$. $M$ in $[M(CO)_6]$	$iii$. $Cu$
$d$. Element with highest heat of atomization $(\Delta_{a} H)$	$iv$. $Zn$
	$v$. $Ni$

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