Hydrogen has the highest calorific value (1,50,000 kJ/kg). Still, it is not used as a fuel because

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It causes a transportation problem

It is explosive

It causes storage problems

All of the above

answer is D.

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Detailed Solution

Hydrogen has the highest calorific value (1,50,000 kJ/kg). Still, it is not used as a fuel because it causes transportation problems. It is explosive and difficult to store.
Hydrogen is highly combustible and reacts explosively when it comes in contact with air. Therefore, it is explosive, and storing hydrogen gas is problematic and harmful at the same time. High pressure must be applied to compress hydrogen gas. Transportation is also a problem in case of liquid hydrogen. So, hydrogen gas has the highest caloric value and is not used as fuel. Kilojoule per kilogram, or kJ/kg, is the unit of calorific value.

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