H2 gas is liberated at cathode and anode both by electrolysis of the following aqueous solution except in

In case of NaClAt anode:2Cl−→Cl2​+2e−At cathode:2H++2e−→H2​So here, Cl2​ liberated at anode.In other cases, hydrides liberate hydrogen gas at anode and hydrogen ion liberates hydrogen gas at cathode.