Which the following fuels has high calorific value?

Which among the following fuels has high calorific value?

A). Coal                                                                 B). Diesel

C). CNG                                                                D). Hydrogen

EXPLANATION

The calorific value of a fuel refers to the amount of energy released when a unit mass of the fuel is completely burned.

It is usually measured in kilojoules per gram (kJ/g) or kilojoules per kilogram (kJ/kg).

Approximate Calorific Values of the Given Fuels:

Fuel Calorific Value
Coal ~25–30 kJ/g
Diesel ~45 kJ/g
CNG ~50 kJ/g
Hydrogen ~150 kJ/g ✅

Why Hydrogen?

  • Hydrogen has the highest calorific value among all known fuels.

  • It releases about 3 times more energy per gram than diesel or CNG.

  • It is a clean fuel – burns to produce only water, making it environmentally friendly.

✅ Final Answer: D) Hydrogen

Which the following fuels has high calorific value?