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# Solution for Question 30: 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. One 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. - CBSE Class 10 - Science

ConceptConventional Sources of Energy

#### Question

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. One 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.

#### Solution

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

Fuel B is the most ideal fuel of the three for the following reasons.
(a) It has a high calorific value.
(b) It burns completely without leaving any residue.

Fuel C has both the characteristics of fuel B but is unsafe as it explodes.

Hence, B is the ideal fuel.

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Solution Question 30: 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. One 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. Concept: Conventional Sources of Energy.
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