Give uses of Dihydrogen as a fuel.

(N/A) Dihydrogen releases large quantities of heat on combustion. Dihydrogen can release more energy than petrol (about $3$ times).
The only pollutants will be the oxides of dinitrogen (due to the presence of dinitrogen as impurity with dihydrogen).
$A$ cylinder of compressed dihydrogen weighs about $30$ times as much as a tank of petrol containing the same amount of energy.
Tanks of metal alloy like $NaNi_{5}$,$Ti-TiH_{2}$,$Mg-MgH_{2}$ etc. are in use for storage of dihydrogen in small quantities.
The basic principle of hydrogen economy is the transportation and storage of energy in the form of liquid or gaseous dihydrogen.
Advantage of hydrogen economy is that energy is transmitted in the form of dihydrogen and not as electric power.