Which of the following halides react(s) with $\mathrm{AgNO}_{3}(\mathrm{aq})$ to give a precipitate that…

Which of the following halides react(s) with $\mathrm{AgNO}_{3}(\mathrm{aq})$ to give a precipitate that dissolves in $\mathrm{Na}_{2} \mathrm{~S}_{2} \mathrm{O}_{3}(\mathrm{aq})$ ?
  1. $\mathrm{HCl}$
  2. $\mathrm{HF}$
  3. $\mathrm{HBr}$
  4. $\mathrm{HI}$

Solution

$\begin{array}{l} \mathrm{HX}+\mathrm{AgNO}_{3} \longrightarrow \mathrm{AgX} \downarrow+\mathrm{HNO}_{3}(\mathrm{X}=\mathrm{Cl}, \mathrm{Br}, \mathrm{I}) \\ \mathrm{AgX}+2 \mathrm{Na}_{2} \mathrm{~S}_{2} \mathrm{O}_{3} \longrightarrow \mathrm{Na}_{3}\left[\mathrm{Ag}\left(\mathrm{S}_{2} \mathrm{O}_{3}\right)_{2}\right]+\mathrm{NaX} \end{array}$

Asked in: JEE Advanced 2012 (Paper 1)

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