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Arrange the following fuels in the order of decreasing calorific values (keeping the fuels with highest calorific value first):
Biogas, Kerosene, Wood, Petrol, Hydrogen gas, Methane
Hydrogen gas>Methane> Petrol > Kerosene > Biogas > Wood
Hydrogen has the highest calorific value where as wood has the lowest calorific value.
The calorific values of three fuels A, B and C are 33 KJ/g, 150 KJ/g, respectively. A is solid, B is liquid and C is a gas at room temperature. On combustion, both A and B produces carbon dioxide while C explodes forming steam. B and C leave no residue after combustion while A leaves behind some solid residue. Which one of the three fuels is the most ideal? Give two reasons to support your answer.