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 55kJ/g and 80 degree Celsius respectively. These values for fuel B are 80kJ/g and 10 degree Celsius respectively. On burning, the fuel A produces CO2 and H2O while the fuel B produces CO2, CO, and SO2. Give three points of relative advantages and disadvantages of these two fuels.

1. Fuel is defined as the substance that is burnt to produce heat Wood, LPG, coal, kerosene, and diesel are the five examples of fuels.

1. Following are the characteristics of fuel:
   1. The calorific value must be
   2. The ignition temperature of the fuel should be

• The fuel should be readily available and

1. When the fuel is burnt, there should not be release of harmful

1. Fuel A:
   1. The calorific value is low that is 55kJ/g which is a disadvantage
   2. The ignition temperature is 80 degree Celsius which moderate and is an advantage

• There are no harmful gases produced which is an

Fuel B:

1. The calorific value is high that is 80kJ/g which is an advantage
2. The ignition temperature is 10 degree Celsius which is a disadvantage

• Harmful gases are released and that is the disadvantage