When electric current is passed through an ionic hydride in the molten state,

Ordinary hydrogen at room temperature is a mixture of

Asthma patients use a mixture of $.....$ for respiration.

Among the following,the correct statements are:
$I$. $LiH, BeH_2$ and $MgH_2$ are saline hydrides with significant covalent character.
$II$. Saline hydrides are volatile.
$III$. Electron-precise hydrides are Lewis bases.
$IV$. The formula for chromium hydride is $CrH$.
The correct option is:

Which property of interstitial hydrides is correct?

Ionic hydrides react with water to give: