Question

$H_2$ gas is liberated at cathode and anode both by electrolysis of the following solution except in

• A. NaCI
• B. NaH
• C. LiH
• D. HCOONa

Answer 1

Answer: (B)

In Nelson's cell, $H_2$ gas is liberated at cathode wheres $C{l}_2$ gas is liberated at anode, on electrolysis of solution of $NaCl$.
$NaCl\rightleftharpoons N{a}^{+}+C{l}^{-}$
$H_{2}O\rightleftharpoons H^{+}+O{H}^{-}$
at cathode
$H^{+}+e^{-}⟶H$
$H+H⟶H_2\uparrow$
at anode
$C{l}^{-}⟶Cl+e^{-}$
$Cl+Cl⟶C{l}_2\uparrow$