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\[
\text { "X" } \mathrm{AgNO}_{3} \longrightarrow\left[\mathrm{Ag}\left(\mathrm{S}_{2} \mathrm{O}_{3}\right)_{2}\right]^{3-} \text {; }
\]
\( \mathrm{P} \)
"X" \( +\mathrm{AgNO}_{3} \stackrel{\Delta}{\longrightarrow} \mathrm{Ag}_{2} \mathrm{~S} \). Then, \( \mathrm{X} \) can be
W
(excess)
(1) \( \mathrm{S}_{2} \mathrm{O}_{3}{ }^{2-} \)
(2) \( \mathrm{S}^{2-} \)
(3) \( \mathrm{SO}_{4}{ }^{2-} \)
(4) \( \mathrm{Cl}^{-} \)
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