Hydrogen from $HCl$ can be prepared by

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

Hydrogen gas is prepared by using $C$ (coke) and steam in the presence of $Fe_2O_3/Cr_2O_3$. This process is known as:

How can $D_2O$ be prepared from water? Mention the physical properties in which $D_2O$ differs from $H_2O$. Give at least three reactions of $D_2O$ showing the exchange of hydrogen with deuterium.

Liquid ammonia is used for refrigeration because

Reaction between the following pairs will produce $H_2$ except: