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JEE Advanced 2012Paper 1
Exam
JEE Advanced
Year
2012
Paper
Paper 1
Subject
Chemistry
Chapter
Practical Chemistry

JEE Advanced 2012 · Paper 1 · Chemistry · Practical Chemistry

Which of the following halides react(s) with AgNO_ 3 (aq) to give a...

Which of the following halides react(s) with AgNO3(aq)\mathrm{AgNO}_{3}(\mathrm{aq}) to give a precipitate that dissolves in Na2 S2O3(aq)\mathrm{Na}_{2} \mathrm{~S}_{2} \mathrm{O}_{3}(\mathrm{aq}) ?

Options

  1. AHCl\mathrm{HCl}
  2. BHF\mathrm{HF}
  3. CHBr\mathrm{HBr}
  4. DHI\mathrm{HI}

Correct answer

A. HCl\mathrm{HCl}

Step-by-step solution

HX+AgNO3⟶AgX↓+HNO3(X=Cl,Br,I)AgX+2Na2 S2O3⟶Na3[Ag(S2O3)2]+NaX\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}
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