Metal hydride on treatment with water gives

The name hydrogen was given by

What do you understand by the terms: $(i)$ hydrogen economy,$(ii)$ hydrogenation,$(iii)$ syngas,$(iv)$ water-gas shift reaction,and $(v)$ fuel-cell?

Complete the reaction: $8LiH + Al_2Cl_6 \to ?$

Atomic weight of the isotope of hydrogen which contains $2$ neutrons in the nucleus would be

Explain the commercial production of $Dihydrogen$.