Which of the following hydrogen halides react(s) with $A g N O_{3}$ (aq) to give a precipitate that dissolves in $N a_{2} S_{2} O_{3}$ (aq)?

H C l

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H F

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H B r

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H I

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Solution

The correct options are
B $H B r$
C $H C l$
D $H I$
Reaction of $H C l$ and $H B r$
$H B r + A g N O_{3} (a q) \to A g B r (s) + H N O_{3}$
$A g B r (s) + N a_{2} S_{2} O_{3} \to 2 N a B r + A g_{2} S_{2} O_{3} N a_{2} S_{2} O_{3} - ---- \to N a_{3} [A g (S_{2} O_{3})_{2}]$ soluble complex.

$H C l + A g N O_{3} (a q) \to A g C l (s) + H N O_{3}$ .
$A g C l (s) + N a_{2} S_{2} O_{3} \to 2 N a C l + A g_{2} S_{2} O_{3} N a_{2} S_{2} O_{3} - ---- \to N a_{3} [A g (S_{2} O_{3})_{2}]$ soluble complex
And a similar reaction for $H I$ .

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