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

Options

A. (a) `2H^(-)(aq)+H_(2)O(l)rarrH_(2)O+H_(2)+2e^(-)`
B. (b) `H^(-)(aq)+H_(2)O(l)rarr OH^(-)+H_(2)`
C. (c) `H^(-)+H_(2)O(l)rarr` No reaction
D. (d) None of the above

Answer

B

Explanation

Sodium hydride dissolved in water as
`NaH+H_(2)O rarr NaOH+H_(2)`
or `H^(-)(aq)+H_(2)O(l)rarr OH^(-)+H_(2)uarr`
In the above reaction hydride ion take proton from water molecule and hydrogen gas is evolved.