What is Carbogen?

The hydrides of which group elements of the periodic table form electron-precise hydrides?

Hydrogen readily combines with metals and thus shows its

The basic principle of the hydrogen economy is the transportation and storage of energy in the form of liquid or gaseous hydrogen. Which property of hydrogen may be useful for this purpose? Support your answer with a chemical equation if required.

Given below are two statements :
Statement-$I$: The process of producing syn-gas is called gasification of coal.
Statement-$II$: The composition of syn-gas is $CO + H_2$ ($1 : 1$ ratio).
In the light of the above statements,choose the most appropriate answer from the options given below:

Atomic hydrogen combines with almost all elements but molecular hydrogen does not. Explain.