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  4. Br- is converted into Br2 by using :

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Q. $Br^{-}$ is converted into $Br_2$ by using :

Redox Reactions

Solution:

Remember : Any halogen placed above in periodic table will oxidize halide ion of halogen placed below.
$Cl_2 + 2 Br^{-} \rightarrow Br_2 + 2Cl^{-} $
Tendancy to undergo oxidation of halide ion increases down the group.