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  4. H 2 gas is liberated at cathode and anode both by electrolysis of the following solution except in

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Q. $H _{2}$ gas is liberated at cathode and anode both by electrolysis of the following solution except in

Bihar CECEBihar CECE 2013Hydrogen

Solution:

In Nelson's cell, $H _{2}$ gas is liberated at cathode wheres $Cl _{2}$ gas is liberated at anode, on electrolysis of solution of $NaCl$.
$NaCl \rightleftharpoons Na ^{+}+ Cl ^{-}$
$H _{2} O \rightleftharpoons H ^{+}+ OH ^{-}$
at cathode
$H ^{+}+ e ^{-} \longrightarrow H$
$H + H \longrightarrow H _{2} \uparrow$
at anode
$Cl ^{-} \longrightarrow Cl + e ^{-}$
$Cl + Cl \longrightarrow Cl _{2} \uparrow$