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The calorific values of five fuels A, B, C, D and E are given below:
(A) 48 kJ/g
(B) 17 kJ/g
(C) 150 kJ/g
(D) 50 kJ/g
Which of the fuels could be: (i) cooking gas (ii) alcohol (iii) wood (iv) hydrogen (v) kerosene ?
(i) D (calorific value of cooking gas)
(ii) E (calorific value of alcohol)
(iii) B (calorific value of wood)
(iv) C (calorific value of Hydrogen)
(v) A (calorific value of kerosene)
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.