Bromine is commercially prepared from sea water by displacement reaction

${\mathrm{Br}}_{2}$ gas thus formed is dissolved into solution of ${\mathrm{Na}}_{2}{\mathrm{CO}}_{3}$ and then pure ${\mathrm{Br}}_{2}$ is obtained by treatment of the solution with :

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#7 | 17th Group

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group 17 ,preparation and properties