(1) Methane and ethane
(2) Methane and hydrogen
(3) Ethanol and methane
(4) Oxygen and butane
Biogas Components Explained
Biogas is a renewable energy source produced from the decomposition of organic matter (like animal waste, sewage, and food waste) in the absence of oxygen, a process called anaerobic digestion.
The primary fuel component of biogas is methane ($CH_4$). While biogas often contains a significant amount of carbon dioxide ($CO_2$), the specific mixture can vary. According to the options provided, the intended composition focuses on methane and another key gaseous product.
Analyzing Biogas Composition Options
- Option 1: Methane and ethane - Ethane ($C_2H_6$) is not a major component of biogas.
- Option 2: Methane and hydrogen - Methane ($CH_4$) is the principal combustible gas in biogas. Hydrogen ($H_2$) is also produced during anaerobic digestion and can be present, especially during specific stages or with certain microbial consortia. This combination represents key gaseous products.
- Option 3: Ethanol and methane - Ethanol ($C_2H_5OH$) is a liquid alcohol and not a primary gaseous component of biogas.
- Option 4: Oxygen and butane - Oxygen ($O_2$) is not produced in anaerobic conditions. Butane ($C_4H_{10}$) is not a typical biogas component.
Therefore, based on the common understanding and the provided options, biogas is best described as a mixture containing methane and hydrogen.
Important Questions from Renewable Energy - Teaching
- Arrange the following in descending order of installed capacity of total solar power as of August, 2025:
A. Gujarat
B. Rajasthan
C. Maharashtra
D. Tamil Nadu
Choose the correct answer from the options given below: - Given below are two statements one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): A wind mill will be more effective if it is placed at a higher elevation above the ground than a lower one.
Reason (R): Generally, the wind speed increases with altitude above the earth's surface.
In the light of the above statements, choose the most appropriate answer from the options given below: Geothermal power plants are much like fossil and nuclear plants with exception of no requirements of:
A. Vapour dominated hydrothermal resources
B. Boiler
C. Fission reactor
D. Turbine generator
Choose the correct answer from the options given below:
Given below are two statements. One labelled as Assertion (A) and the other labelled as Reason (R) :
Assertion (A) : OTEC power plants have low efficiences.
Reason (R) : Efficiency is governed by 2nd law of thermodynamics.
Choose the correct answer :- Given below are two statements. One labelled as Assertion (A) and the other labelled as Reason (R) :
Assertion (A) : The efficiency of a silicon solar cell decreases with increase in temperature.
Reason (R) : The intrinsic resistance of the solar cell increases with rise in temperature.
Choose the correct answer :
