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Q.

The reaction that is not involved in Castner - Kellner process of preparation of sodium hydroxide is

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a

C{l^ - }\; \to \;\frac{1}{2}C{l_2}\; + \;{e^ - }

b

\large N{a^ + }\; + \;{e^ - }\;\xrightarrow{{\;\;Hg\;\;}}\;Na.Hg

c

2Na.Hg\; + \;2{H_2}O\; \to \;2NaOH\; + \;2Hg\; + \;{H_2}

d

NaHg\; + \;N{H_3}\; \to \;NaN{H_2}\; + \;Hg\; + \;{H_2}

answer is D.

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Detailed Solution

Electrolyte : Fused NaCl
Electrolysis : NaCl → Na⁺ + Cl^-
$\large At\;cathode\;\left[ {\operatorname{Reduction}} \right]\;:\;N{a^ + }\; + \;{e^ - }\;\xrightarrow{{\;\;Hg\;\;}}\;Na.Hg$
2 Na.Hg + 2H₂O → 2NaOH + 2Hg + H₂↑
$\large At\;anode\;\left[ {Oxidation} \right]\;:\;C{l^ \ominus }\; \to \;\frac{1}{2}C{l_2}\; + \;{e^ - }$

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The reaction that is not involved in Castner - Kellner process of preparation of sodium hydroxide is