Question

Which of the following fuels has the highest calorific value?

• A. Petrol
• B. Hydrogen
• C. LPG
• D. Natural gas

Answer 1

The correct option is B

Hydrogen

Explanation for correct option:

B. Hydrogen

Calorific value:

• “The amount of heat energy produced on complete combustion of $1\mathrm{kg}$of a fuel is called its calorific value.”
• The calorific value of a fuel is expressed in a unit called kilojoule per kg $(\mathrm{kJ}{\mathrm{kg}}^{-1})$.
• Hydrogen has the highest calorific value which is $150000\mathrm{kJ}{\mathrm{kg}}^{-1}$.

Explanation for incorrect options:

A. The calorific value of petrol is $45000\mathrm{kJ}{\mathrm{kg}}^{-1}$.

C. The calorific value of LPG is $55000\mathrm{kJ}{\mathrm{kg}}^{-1}$.

D. The calorific value of Natural gas is $50000\mathrm{kJ}{\mathrm{kg}}^{-1}$.

Hence, the correct option is B i.e. Hydrogen has the highest calorific value.