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Chemistry Question on hydrides

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

A

2H−(aq)+H2O(l)→H2O+H2+2e−2H^-(aq)+ H_2O(l) \rightarrow H_2O+H_2+2e^-

B

H−(aq)+H2O(l)→OH−+H2H^-(aq)+ H_2O(l) \rightarrow OH^-+H_2

C

H−+H2O(l)→H^-+H_2O(l) \rightarrow No reaction

D

None of the above

Answer

H−(aq)+H2O(l)→OH−+H2H^-(aq)+ H_2O(l) \rightarrow OH^-+H_2

Explanation

Solution

Sodium hydride dissolved in water as \hspace20mm NaH+H_2O \rightarrow NaOH+H_2 or \hspace15mm H^-(aq)+H_2O(/) \rightarrow OH^-+H_2 ↑\uparrow In the above reaction hydride ion take proton from water molecule and hydrogen gas is evolved.