The correct answer is A. methane, carbon dioxide, nitrogen and hydrogen.
Biogas is a mixture of gases produced by the breakdown of organic matter in the absence of oxygen. It is a renewable energy source that can be used to generate electricity, heat, and transportation fuel.
The main components of biogas are methane (CH4), carbon dioxide (CO2), and nitrogen (N2). Methane is the most abundant component of biogas, typically accounting for 50-75% of the total volume. Carbon dioxide is the second most abundant component, typically accounting for 25-40% of the total volume. Nitrogen is the third most abundant component, typically accounting for 5-10% of the total volume.
Other components of biogas may include hydrogen (H2), oxygen (O2), and sulfur (S). The concentration of these components can vary depending on the source of the organic matter and the process used to produce biogas.
Biogas is a clean and efficient energy source that can help to reduce greenhouse gas emissions. It is also a renewable resource that can help to reduce our reliance on fossil fuels.
Here is a brief explanation of each option:
- Option A: Methane, carbon dioxide, nitrogen and hydrogen. This is the correct answer. Methane is the main component of biogas, followed by carbon dioxide and nitrogen.
- Option B: Carbon dioxide, nitrogen and hydrogen. This option is incorrect because it does not include methane.
- Option C: Ethane, carbon dioxide, nitrogen and hydrogen. This option is incorrect because it does not include methane.
- Option D: Methane, carbon dioxide, nitrogen and sulphur. This option is incorrect because it includes sulphur, which is not a major component of biogas.