Metals like platinum and palladium can absorb large volumes of hydrogen under special conditions. Such adsorbed hydrogen by the metal is known as

Ortho and para hydrogen differ in

Which of the following acids does not produce $H_2$ gas upon reaction with alkali metals?

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 of the following processes does not involve the use of dihydrogen?

State the abundance and symbol of protium and deuterium in hydrogen atoms.