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Hydrochloric Acid

Which of the ...

Question

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

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
A $H C l$
C $H B r$
D $H I$
$H C l + A g N O_{3} \to A g C l ↓ + H N O_{3}$
$A g C l + 2 N a_{2} S_{2} O_{3} \to N a_{3} [A g (S_{2} O_{3})_{2}] + N a C l$

$H B r + A g N O_{3} \to A g B r ↓ + H N O_{3}$
$A g B r + 2 N a_{2} S_{2} O_{3} \to N a_{3} [A g (S_{2} O_{3})_{2}] + N a B r$

$H I + A g N O_{3} \to A g I ↓ + H N O_{3}$
$A g I + 2 N a_{2} S_{2} O_{3} \to N a_{3} [A g (S_{2} O_{3})_{2}] + N a I$

whereas, $A g N O_{3}$ with $H F$ forms a soluble silver fluoride, and hence no precipitate is formed.
$H F + A g N O_{3} \to A g F (s o l u b l e) + H N O_{3}$

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