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

JEE Advanced · 2012 · 08 Apr 2012 · Paper 1 · Practical and Analytical Chemistry

Which of the following hydrogen halides react(s) with

AgNO_{3} (aq)

to give a precipitate that dissolves in

Na_{2} S_{2} O_{3} (aq)

(A)HCl✓ Correct
(B)HF
(C)HBr✓ Correct
(D)HI✓ Correct

Answer: (A), (C), (D)

Solution

Hydrogen halides react with

AgNO_{3}

to form silver halide precipitates:

HX + AgNO_{3} \to AgX ↓ + HNO_{3}

(where X = Cl, Br, I). HF does not form a precipitate because AgF is soluble in water. The silver halide precipitates (AgCl, AgBr, AgI) dissolve in sodium thiosulfate solution through complexation:

AgX + 2 Na_{2} S_{2} O_{3} \to Na_{3} [Ag (S_{2} O_{3})_{2}] + NaX

. Therefore, HCl, HBr, and HI all form precipitates that dissolve in

Na_{2} S_{2} O_{3}

JEE Advanced · 2012 · 08 Apr 2012 · Paper 1 · One or more correct options

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