Calorific value and ignition temperature of fuel X are 75 kJ/g and 20°C respectively. These values for fuel Y are 50 kJ/g and 75°C respectively. On burning, the fuel Y produces only CO2 while fuel X produces CO2 and CO. Which of the two is a better fuel? Give two reasons to support your answer.
Fuel Y is the better fuel because of the following reasons:
(a) It has a moderate ignition temperature of 75°C, which means it is neither too high nor too low.
(b) It does not produce harmful gases like carbon monoxide (CO) on burning.
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