An aqueous solution contains \( \mathrm{Hg}^{2+}, \mathrm{Hg}_{2}^{2+}, \mathrm{Pb}^{2+} \) and ....

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An aqueous solution contains \( \mathrm{Hg}^{2+}, \mathrm{Hg}_{2}^{2+}, \mathrm{Pb}^{2+} \) and
\( \mathrm{P} \)
\( \mathrm{Cd}^{2+} \). The addition of dil. \( \mathrm{HCl} \) (approx. 6M) will precipitate:
(1) \( \mathrm{PbCl}_{2} \) only
(2) \( \mathrm{Hg}_{2} \mathrm{Cl}_{2} \) only
(3) \( \mathrm{PbCl}_{2} \) and \( \mathrm{Hg}_{2} \mathrm{Cl}_{2} \)
(4) \( \mathrm{PbCl}_{2} \) and \( \mathrm{HgCl}_{2} \)


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