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  4. In the extraction of chlorine by electrolysis of brine .

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Q. In the extraction of chlorine by electrolysis of brine _________.

General Principles and Processes of Isolation of Elements

Solution:

In the extraction of chlorine by electrolysis of brine, oxidation of $Cl ^{-}$ ion to chlorine gas occurs.

$2Cl ^{-}+2 H _{2} O \rightarrow 2 OH ^{-}+ H _{2}+ Cl _{2}$