Question

Which of the following has the highest calorific value?
A.Petrol
B.Coke
C.Natural gas
D.Kerosene

Answer 1

Hint:
Calorific value is the measurement of energy released on combustion of a fuel.

Complete step by step answer:
To determine the highest calorific value among the given options, we first have to know the calorific value of each. The calorific value of petrol is 48,000 kJ/kg , calorific value of coke is 31,000 kJ/kg, calorific value of natural gas is 43000 kJ/kg and calorific value of kerosene is 46200 kJ/kg. From the values of calorific value of each substance, petrol, coke, natural gas and kerosene, petrol has the highest calorific value.

Additional Information:
-Petrol is a fuel mainly composed of light hydrocarbon ranging from C5 to C12. This is more inflammable than diesel.
-Coke is a hard grey colored fuel having high content of carbon and few impurities. -This is manufactured by heating coal in the absence of air by destructive distillation process. It is mainly used in smelting of iron ore and also used as a fuel in stoves. But it can also cause air pollution.
-Natural gas is a naturally occurring mixture of gaseous hydrocarbons, such as methane and higher alkanes and also consists of a small percentage of nitrogen, carbon dioxide, hydrogen sulphide etc.
-Kerosene is a combustible liquid of hydrocarbon obtained from petroleum. It is used as a fuel in households as well as in the aviation sector.

Note:
When a fuel product undergoes combustion, it produces water vapour. There are certain methods which are used to recover heat contained in the water vapor by the condensation method. This is how the calorific value is determined. The unit used to measure calorific value is kJ/kg.