Biogas mainly consist of

Options

A. Ethane
B. `CO_(2)`
C. `H_(2)`
D. Methane

Answer

**Step-by-Step Solution:**

1. **Understanding Biogas**: Biogas is a renewable source of energy produced from the anaerobic decomposition of organic matter and waste materials. This process occurs in the absence of oxygen.

2. **Composition of Biogas**: Biogas is not a single gas but a mixture of different gases. The main components of biogas include methane, carbon dioxide, and a small amount of hydrogen.

3. **Identifying the Main Component**:
- **Methane**: This is the primary component of biogas, making up about 50-75% of its composition.
- **Carbon Dioxide**: This gas constitutes about 25-35% of biogas.
- **Hydrogen**: This is present in very small quantities, approximately 0-1%.

4. **Conclusion**: Given the percentages of the gases present in biogas, it is clear that the main component is methane.

5. **Final Answer**: Therefore, biogas mainly consists of methane.

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