(A) The dissociation of fused sodium hydride is given by: $NaH \rightleftharpoons Na^{+} + H^{-}$.At the anode,the hydride ion $(H^{-})$ undergoes oxi

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(A) The dissociation of fused sodium hydride is given by: $NaH \rightleftharpoons Na^{+} + H^{-}$.At the anode,the hydride ion $(H^{-})$ undergoes oxidation to release hydrogen gas:$H^{-} \to H + e^{-}$$H + H \to H_2$ (gas).Therefore,hydrogen is liberated at the anode.