Question

Calorific value and ignition temperature of fuel X are 75 kj/g and ${20}^{\circ }C$ respectively. These values for fuel Y are 50 kj/g and ${75}^{\circ }C$ respectively. On burning, the fuel Y produces only $C{O}_2$ while fuel X produces $C{O}_2$ and CO. Which of the two is a better fuel? Give two reasons to support your answer.

Answer 1

As calorific value increases more heat is produced.
Ignition Temperature is temperature at which fuel starts to burn.
Complete combustion produce more energy and product s will be CO2 and H2O

X High calorie	y Low calorie
Low ignition	high ignition
Incomplete combustion	complete combustion

X is better when considering
High calorific value
​​​​and lowest ignition temperature (as burns soon)