A) Hydrogen < LPG < Biogas < Cow dung cake < coal
B) Cow dung cake < Biogas < LPG < Coal < Hydrogen
C) Cow dung cake < Coal < Biogas < LPG < Hydrogen
D) Hydrogen < Cow dung cake < LPG < Biogas < Coal
Correct Answer: C
Solution :
| Fuel | Calorific value (kJ/kg) |
| Cow dung cake | 6,000 - 8,000 |
| Coal | 25,000 - 33,000 |
| Biogas | 35,000 - 40,000 |
| LPG | 55,000 |
| Hydrogen | 1,50,000 |
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