Some reasons are given regarding the limited use of H2 as fuel.
I) Its calorific value is low.
II) Its availability in free state is less.
III) It is difficult to store.
IV) It is not a clean fuel.
The correct statements are?
II and III
As a fuel, Hydrogen is very difficult to store. It is extremely reactive and it combines with most of the metals and non-metals forming stable compounds. Thus is it is not available in free state.