Which of the following two are the main constituents of biogas? 1. Methane 2. Butane 3. Carbon dioxide 4. Carbon monoxide Select the correct answer using the code given below.

उत्तर देखें और व्याख्या

उत्तर: (C) 1 and 3

व्याख्या

Biogas is mostly methane (50-75%) and carbon dioxide (25-50%).