In the manufacture of sodium hydroxide, by product obtained is:

$O_{2}$

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$C l_{2}$

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$N a_{2} C O_{3}$

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$N a C l$

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Solution

The correct option is B
$C l_{2}$

A brine solution is electrolysed using a mercury cathode and a carbon anode. Sodium metal discharged at the cathode combines with mercury to from sodium amalgam. Chlorine gas is evolved at the anode

Cathode : $N a^{+} + e^{-} M g - - \to$ Sodium amalgam

Anode : $C l^{-} \to \frac{1}{2} C l_{2} + e^{-}$

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