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Question

A solution containing $B r^{-}$ ions is treated with each of the following. Which of these will not liberate bromine gas (in acidic medium) ?

A

C l_{2}

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B

H I

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C

I_{2}

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D

S O_{3}

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Solution

The correct options are
B $H I$
C $I_{2}$
$C l_{2}$ and $S O_{3}$ being stronger oxidising agent, oxidise $B r^{-}$ to $B r_{2}$ gas
$2 B r^{-} + C l_{2} \to B r_{2} + 2 C l^{-}$
$S O_{3} \to S O_{2} + [O]$
$2 B r^{-} + 2 H^{+} + [O] \to B r_{2} + H_{2} O$
$2 B r^{-} + 2 H^{+} + 2 H^{+} \to B r_{2} + H_{2} O + S O_{2}$
HI being reducing agent and $I_{2}$ being weak oxidising agent (comes after bromine) don't liberate bromine from $B r_{-}$ .

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