Answer:
Metals are electropositive elements
and when their compounds with non-metals (e.g. NaCI) are electrolysed, these
are discharged at cathode. Hydrogen can also behave similarly when combined with
a highly electronegative element like chlorine (e.g. \[HCl\]). When the
electrolysis of the molten acid is carried, hydrogen is also evolved at the
cathode.
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