What is the reaction occurring at the anode in Down's process for the extraction of sodium?

What is the reaction occurring at the anode in Down's process for the extraction of sodium?
  1. $4 \mathrm{OH}^{-} \longrightarrow 2 \mathrm{H}_2 \mathrm{O}+\mathrm{O}_2+4 e^{-}$
  2. $\mathrm{Na}^{+}+e^{-} \longrightarrow \mathrm{Na}$
  3. $2 \mathrm{Cl}^{-} \longrightarrow \mathrm{Cl}_2+2 e^{-}$
  4. $\mathrm{NaOH} \longrightarrow \mathrm{Na}^{+}+\mathrm{OH}^{-}$

Solution

In Down's process, at anode, oxidation of $\mathrm{Cl}^{-}$into $\mathrm{Cl}_2$ gas takes place $ 2 \mathrm{Cl}^{-} \longrightarrow \mathrm{Cl}_2+2 e^{-} $

Asked in: AP EAMCET 2002

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