Correct Answer - Option 4 : Hydrogen
The correct answer is Hydrogen.
Concept -
Calorific Value:
- The total energy released as heat when a substance undergoes complete combustion with oxygen under standard conditions is referred to as the calorific value.
- The calorific value of fuel or meal determines its efficiency.
- If the value is high, then the efficiency will be high as well.
- If the value is low, the efficiency will suffer as well.
- The efficiency of a product is directly related to its calorific value.
-
Kilojoule per kilogramme, or KJ/Kg, is the unit of calorific value.
- Some fuels with their respective calorific values are provided below in the table -
|
Fuel
|
Calorific Value
(kJ/kg)
|
|
|
Cow dung cake
|
6000 - 8000
|
Lowest Value
|
|
Wood
|
17,000 - 22,000
|
|
|
Coal
|
25,000 - 33,000
|
|
|
Petrol
|
45,000
|
|
|
Kerosene
|
45,000
|
|
|
Deisel
|
45,000
|
|
|
Methane
|
50,000
|
|
|
CNG
|
50,000
|
|
|
LPG
|
55,000
|
|
|
Biogas
|
35,000 - 40,000
|
|
|
Hydrogen
|
1,50,000
|
Highest Value
|
Explanation -
-
Hydrogen has a calorific value of 150000kJ/kg.
- It has thus, the highest calorific value.
- Having a high caloric value means it has the highest efficiency too.
Hence, Hydrogen has the maximum calorific value.
