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(A) Sodium hydroxide $(NaOH)$ is prepared commercially by the electrolysis of brine ($NaCl$ solution) in a $Castner-Kellner$ cell.At the cathode,sodiu

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$NaOH$

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(A) Sodium hydroxide $(NaOH)$ is prepared commercially by the electrolysis of brine ($NaCl$ solution) in a $Castner-Kellner$ cell.At the cathode,sodium ions are reduced to sodium amalgam $(Na-Hg)$:$Na^{+} + e^{-} \xrightarrow{Hg} Na-Hg$At the anode,chloride ions are oxidized to chlorine gas:$Cl^{-} \longrightarrow \frac{1}{2}Cl_{2} + e^{-}$The sodium amalgam is then treated with water to produce sodium hydroxide and molecular hydrogen gas as a byproduct:$2Na(amalgam) + 2H_{2}O \longrightarrow 2NaOH + H_{2} + 2Hg$

In the industrial production of which of the following,molecular hydrogen is obtained as a byproduct?

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