Hydrogen compounds are abundantly available on earth, and it has high calorific value. But this is not used as a common fuel. Give any two reasons. What are the processes that are being developed to use hydrogen as a common fuel ?

Explanation

Hydrogen is not used as a common fuel because :
(i) When hydrogen is lighted, it burns with an explosion.
(ii) It is very difficult to store and transport hydrogen.
Hydrogen as a fuel :
Fuel cells are being developed that can store energy produced by burning hydrogen. Development of some materials that can absorb hydrogen and then release it at a steady rate.