(A) Ionic hydrides consist of $M^+H^-$ ions in the molten state.When electric current is passed,the hydride ion $(H^-)$ migrates towards the anode.At

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Hydrogen is liberated at the anode

(A) Ionic hydrides consist of $M^+H^-$ ions in the molten state.When electric current is passed,the hydride ion $(H^-)$ migrates towards the anode.At the anode,the hydride ion undergoes oxidation to release hydrogen gas:$H^- \to \frac{1}{2}H_2 + e^-$Therefore,hydrogen is liberated at the anode.