Q15 / 60 · JEE Advanced 2012 (Paper 1) · Chemistry

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

  • Correct answer
    A
    $\mathrm{HCl}$
  • B
    $\mathrm{HF}$
  • Correct answer
    C
    $\mathrm{HBr}$
  • Correct answer
    D
    $\mathrm{HI}$

Solution

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

Hence, the correct answer is options: 'A', 'C', 'D'.

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