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Brine is electrolysed by using inert electrodes. The reaction at anode is
(i) \( \mathrm{Cl}^{-} \)(aq.) \( \longrightarrow \frac{1}{2} \mathrm{Cl}_{2}(\mathrm{~g})+\mathrm{e}^{-} ; \quad E_{\text {Cell }}^{\ominus}=1.36 \mathrm{~V} \)
(ii) \( 2 \mathrm{H}_{2} \mathrm{O}(\mathrm{1}) \longrightarrow \mathrm{O}_{2}(\mathrm{~g})+4 \mathrm{H}^{+}+4 \mathrm{e}^{-}: E_{\text {Cell }}^{\ominus}=1.23 \mathrm{~V} \)
(iii) \( \mathrm{Na}^{+} \)(aq.) \( +\mathrm{e}^{-} \longrightarrow \mathrm{Na}(\mathrm{s}): \quad E_{\text {Cell }}^{\ominus}=2.71 \mathrm{~V} \)
(iv) \( \mathrm{H}^{+} \)(aq.) \( +\mathrm{e}^{-} \longrightarrow \frac{1}{2} \mathrm{H}_{2}(\mathrm{~g}) ; \quad E_{\mathrm{Cell}}^{\ominus}=\mathrm{O} . \mathrm{OOV} \)
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