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

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

JEE MainJEE Main 2022Hydrogen

Solution:

Sodium hydroxide is generally prepared commercially by electrolysis of sodium chloride in castner Kellner cell.
at cathode : $Na + e ^{-} \xrightarrow{ Hg }Na -$ amalgum
Anode $: Cl ^{-} \longrightarrow \frac{1}{2} Cl _{2}+ e ^{-}$
The $Na$-amalgam is treated with water to give sodium hydroxide and hydrogen gas :
$2 Na$ (amalgam) $+ H _{2} O \rightarrow 2 NaOH + H _{2}+2 Hg$