Question

Which of the following fuels has the highest calorific value?
A. Petrol
B. Hydrogen
C. LPG
D. Natural gas

Answer 1

Hint: Calorific value of a fuel can be used to determine the quality of the fuel. It tells us how efficient the fuel is for our uses. You might come across this term when you go to your LPG gas suppliers or in your gas bill.

Complete step by step solution:

When we burn fuels, heat is produced. The amount of heat produced varies from fuel to fuels and is expressed in terms of calorific value. Calorific value of a fuel is defined as the amount of heat produced when 1 gm of fuel is completely burnt. It's S.I. unit of is kilojoule per gram (KJ/g). The comparison between the calorific values of fuels helps us to decide which fuel is better for our use. Generally, a fuel having higher calorific value is considered to be a good fuel. Calorific value can be measured either in terms of Gross calorific value (GCV), which assumes all vapor produced during the combustion process is fully condensed or Net calorific value (NCV), which assumes the water leaves with the combustion products without fully being condensed.
Now, let us take a look at the calorific values of our options:
Petrol- 48 KJ/g
Hydrogen- 141.79 KJ/g
LPG- 50 KJ/g
Natural Gas- 52.3 KJ/g

Therefore, the correct option is (b).

Note: Our body also requires calories to carry out various daily activities. If we stop providing calories daily, the body would eventually stop working and all the cells in our body will die.