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:

Sodium forms a crystalline ionic solid with dihydrogen. The solid is non-volatile and non-conducting in nature. It reacts violently with water to produce dihydrogen gas. Write the formula of this compound and its reaction with water. What will happen on electrolysis of the melt of this solid?

Non-stoichiometric hydrides are formed by

Which among the following is/are primary component$(s)$ of the synthesis gas?

Calorific value of producer gas is low because of

Action of water or dilute mineral acids on metals can give