Question

Arrange the following in descending order based on their calorific value.
(i) Wood
(ii) LPG
(iii) Hydrogen
(iv) Petrol

• A. LPG > Hydrogen > Petrol > Wood
• B. Hydrogen > Petrol > Wood > LPG
• C. Wood > Hydrogen > Petrol > LPG
• D. Hydrogen > LPG > Petrol > Wood

Answer 1

The correct option is D Hydrogen > LPG > Petrol > Wood

The amount of heat energy produced on
complete combustion of 1 kg of a fuel is
called its calorific value.
The calorific value of wood is around 17,000-22,000 kJ/kg and it is the least among the given options.
The calorific values of LPG and petrol are 55,000 kJ/kg and 45,000 kJ/kg respectively.
Hydrogen whose calorific value is 1,50,000 kJ/kg, is used as a rocket fuel.