State any four characteristics of an ideal fuel (or good fuel).

(a) What is a fuel ? Give five examples of fuels. (b) What are the characteristics of an ideal fuel (or good fuel) ? (c ) The calorific value and ignition temperature of fuel A are 55 kJ/g and 80^(@)C , respectively. These values for fuel B are 80 kJ/g and 10^(@)C , respectively. On burning, the fuel A produces CO_(2) and H_(2)O while the fuel B produces CO_(2), CO and SO_(2) . Give three points of relative advantages and disadvantages of these two fuels.

Write any three characteristics of a good fuel.

State any four characteristics of a good source of energy.