Which compound is used in hydrogen generators?

With which of the following does hydrogen combine directly?

The ionization of a hydrogen atom gives rise to:

The hydrides of which group elements are examples of electron-precise hydrides?

If the boiling point of $H_{2}O$ is $373\,K$,the boiling point of $H_{2}S$ will be:

$BeCl_2 + LiAlH_4 \to X + LiCl + AlCl_3$
Total number of $3c-4e^\Theta$ bonds present in the monomer form of compound $(X)$ is: