Question

Incomplete combustion of fuel such as petrol and diesel give:
A. Nitrogen oxide
B. Sulphur dioxide
C. Carbon monoxide
D. Carbon dioxide

Answer 1

Hint: As we know complete combustion occurs when there is enough oxygen to completely use up all the reactants whereas incomplete combustion occurs when there is not enough oxygen resulting in the production of smoke.

Complete answer step by step:
When the supply of oxygen is very less then it leads into incomplete combustion. Instead of Carbon dioxide \[C{{O}_{2}}\] it will produce carbon monoxide CO and carbon C along with water.
Let us see the general reaction of incomplete combustion:
\[Hydrocarbon+Oxygen(O)\to CarbonMonoxide(CO)+Carbon(C)+Water({{H}_{2}}O)\]
Hence, from the above reaction, it is concluded that after the incomplete combustion of fuels such as petrol and diesel give Carbon monoxide and Carbon instead of Carbon dioxide. Therefore, the correct option is (C).
As we know, carbon monoxide consists of a single carbon atom and one oxygen atom connected by triple bond. It is colourless in colour, odourless in odour, and tasteless in taste.
Carbon monoxide is highly toxic and considered as fatal air to many countries. It combines haemoglobin to form carboxyhemoglobin and thus reduces the capacity of blood to carry oxygen.

Note: Remember, during the combustion, there is a reaction of nitrogen gas and oxygen in the air and form the product nitrogen oxide. Similarly, sulfur dioxide formed when there is a combustion of sulfur contains fuels.