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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

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

b

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

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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