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(b) Ethane



               (c) Propane


               (d) Butane





               Subjective Questions:


               1. Explain the working of biogas plant by drawing a labeled diagram.

               2. Why is biogas considered as an ideal fuel for domestic use?


               3. Biogas is considered to be a boon to the farmers. Justify

               4. Charcoal is better fuel than wood. Give reasons.


               5. Why commercial exploitation of geothermal energy is difficult?
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