Question

Which of the following displaces $Br _{2}$ from an aqueous solution containing bromide ions?

• A. $Cl^{-}$
• B. $Cl_{2}$
• C. $I _{3}^{-}$
• D. $I_{2}$

Answer 1

Answer: (B)

$Cl_{2}$

Answer 2

All the halogens act as strong oxidising agents since, they have a strong tendency to attract electrons. The oxidising power decreases from $F$ to $I$.
ie, $F _{2}> Cl _{2}> Br _{2}> I _{2}$.
So, $Cl _{2}$ will displace $Br ^{-}$and $I ^{-}$ions from their solutions.
$Cl _{2}+2 Br ^{-} \longrightarrow Br _{2}+2 Cl ^{-} .$