Which one of the following statements about biogas is <strong>NOT</strong> correct?
- A. It is mainly composed of methane gas.
- B. It is a non-renewable source of energy. ✓
- C. It is formed by the decomposition of cow dung in the absence of oxygen.
- D. It burns without smoke and leaves no residue.
Correct Answer: B. It is a non-renewable source of energy.
Explanation
Biogas is a renewable source of energy because it is continuously produced from organic waste like cow dung, agricultural residue, and municipal waste.
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