The hydride ion H^- is stronger base than its hydroxide ion OH^-. Which of the following reactions will occur if sodium hydride (NaH) is dissolved in water?

Sodium hydride (NaH) exists as ${\mathrm{Na}}^{+} \mathrm{and} {\mathrm{H}}^{-}.$ Hydride ion (acts as a base) and when it dissolve in water, then water acts as acid. The reaction that takes place in water after the addition of NaH is:

${\mathrm{H}}^{-}+{\mathrm{H}}_2\mathrm{O}\to {\mathrm{OH}}^{-}+{\mathrm{H}}_2$