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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Important Questions from Energy and Environment - Teaching
- Arrange the following states of India in the increasing order of total installed capacity of renewable power as of August, 2025.
A. Uttar Pradesh
B. Gujrat
C. Tamil Nadu
D. Karnataka
Choose the correct answer from the options given below: - Which of the following aims to improve thermal comfort and reduce energy use in residential buildings?
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A. Site inspection of auditor
B. Analizing the past pattern of energy use
C. Auditor-client meeting
D. Implementation of auditor's recommendation
E. Auditor's report
Choose the correct answer from the options given below: - Diagonal lines in interiors suggest :
- Which of the following fuels has the highest HHV carbon intensity ?
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