\( \mathrm{Na}_{2} \mathrm{~S}_{2} \mathrm{O}_{3}+\mathrm{HgCl}_{2}...

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\( \mathrm{Na}_{2} \mathrm{~S}_{2} \mathrm{O}_{3}+\mathrm{HgCl}_{2}+\mathrm{H}_{2} \mathrm{O} \longrightarrow \mathrm{X} \) black ppt, where
P \( \mathrm{X} \) can be

W
(1) \( \mathrm{Ag}_{2} \mathrm{~S} \)
(2) \( \mathrm{HgS} \)
(3) \( \mathrm{Hg}_{2} \mathrm{Cl}_{2} \)
(4) \( \mathrm{Hg}_{2} \mathrm{I}_{2} \)
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