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Question
Name the processes from which chlorine is obtained as a by-product.
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Solution
Down’s process involving the electrolysis of fused NaCl yields chlorine as a by-product.
\[\ce{NaCl (fused) -> Na+ + Cl-}\]
At cathode: \[\ce{Na+ + e- -> Na_{(s)}}\]
At anode: \[\ce{Cl- + e- -> \frac{1}{2} Cl2_{(g)}}\]
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