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Which of the comparison regarding \( \mathrm{Zn}, \mathrm{Cd}, \mathrm{Hg} \) is/are incorrect ?
(I) \( \mathrm{ZnCl}_{2} \) is ionic whereas \( \mathrm{CdCl}_{2} \) and \( \mathrm{HgCl}_{2} \) are covalent
\( P \)
(II) \( \mathrm{Zn} \) and \( \mathrm{Cd} \) dissolves in dilute acid ( \( \mathrm{HCl} \) ) liberating \( \mathrm{H}_{2} \) but \( \mathrm{Hg} \) can not
(III) \( \mathrm{Zn} \) and \( \mathrm{Cd} \) forming with ppt. of \( \mathrm{Zn}(\mathrm{OH})_{2} \) and \( \mathrm{Cd}(\mathrm{OH})_{2} \) but \( \mathrm{Hg} \) forms coloured ppt. of
W. \( \mathrm{Hg}(\mathrm{OH})_{2} \)
(IV) all form \( \mathrm{A}_{2}^{2+} \) type ion
(a) only III
(b) I, III, IV
(c) I and III
(d) all of these
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