The calorific values of three fuels A, B and C are 33 kJ/g, 48 kJ/g and 150 kJ/g, respectively. A is solid, B is liquid and C is a gas at room temperature. On combustion, both A and B produce 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.

Academic Physics NCERT Class 10

Fuel B is the most ideal fuel of the three for the following reasons:

(i) It has a high calorific value of 48 kJ/g.

(ii) It does not leave any residue and burns completely.

Explanation

Fuel A has a lower calorific value when compared with the other fuels, and therefore, cannot be considered the most ideal fuel.

Fuel C has both the characteristics of fuel B but is not safe, as it explodes.

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Updated on: 10-Oct-2022

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