Question
In terms of the calorific value, identify the correct sequence :
The correct answer is
Hydrogen > methane > ethanol > methanol
Calorific Value Sequence Explained
The calorific value represents the amount of heat energy released per unit mass during the complete combustion of a substance.
Substance Calorific Values
Comparing the typical calorific values (on a mass basis) for the given substances:
- Hydrogen ($H_2$): Approximately 142 MJ/kg. This is significantly higher than the others.
- Methane ($CH_4$): Approximately 55.5 MJ/kg. The primary component of natural gas.
- Ethanol ($C_2H_5OH$): Approximately 29.7 MJ/kg. An alcohol fuel.
- Methanol ($CH_3OH$): Approximately 22.7 MJ/kg. Another alcohol fuel, with a lower value than ethanol.
Correct Sequence Determination
Based on these values, the correct sequence from highest calorific value to lowest is:
Hydrogen > Methane > Ethanol > Methanol
This order corresponds to Option B.
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A. Uttar Pradesh
B. Gujrat
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