Question

Incomplete combustion of fuel such as petrol and diesel gives?

• A. Nitrogen oxide
• B. Sulphur dioxide
• C. Carbon monoxide
• D. Carbon dioxide

Answer 1

The correct option is C

Carbon monoxide

The explanation for the correct option:

Option(C) Carbon monoxide

• Incomplete combustion is called a process in which a reaction occurs between oxygen and fuel (petrol and diesel) giving products carbon monoxide$\left(\mathrm{CO}\right)$ and water.
• The general reaction of incomplete combustion can be given as:
  $\mathrm{Hydrocarbon}+\mathrm{Oxygen}\left(\mathrm{O}\right)\to \mathrm{CarbonMonoxide}\left(\mathrm{CO}\right)+\mathrm{Carbon}\left(\mathrm{C}\right)+\mathrm{Water}\left({\mathrm{H}}_2\mathrm{O}\right)$
• Incomplete combustion occurs when combustion occurs without a sufficient supply of oxygen.
• Incomplete combustion can also produce pure carbon soot, which is messy and can build up in chimneys.

The explanation for the incorrect options:

Option(A) Nitrogen oxide

• Petrol and diesel are known as carbon-containing hydrocarbons, hence the incomplete combustion of these can generate carbon monoxide as the product.
• As in hydrocarbons, there is no nitrogen substance present, thus nitrogen oxide does not form as the product in the incomplete combustion.
• Hence, the given option is the incorrect one.

Option(B) Sulphur dioxide

• Sulfur dioxide generally gets formed when there is a combustion of sulfur contains fuels.
• Fuel such as petrol and diesel, are known to be hydrocarbons and do not contain sulfur in them.
• Hence, the incomplete combustion of fuels such as petrol and diesel does not give sulfur dioxide as the product.

Option(D) Carbon dioxide

• Incomplete combustion of fuel such as petrol and diesel generally gives carbon monoxide as the product, whereas carbon dioxide is not produced during the process.
• Thus, the given option does not coincide with the correct concept.

Therefore, option (C) is the correct answer i.e incomplete combustion of fuel such as petrol and diesel gives carbon monoxide $\left(\mathrm{CO}\right)$.