Question

Combustion of most fuels releases:
(A) $C{{O}_{2}}$
(B) $S{{O}_{2}}$
(C) $N{{O}_{2}}$
(D) oxygen

Answer 1

Hint: Fuel is the material which on reaction with any substance releases energy in the form of heat energy or the material can be used to do work or we can say that on combustion any substance which produces a usable amount of energy is known as fuel.

Complete answer:
The fuels are generally classified on the basis of their physical state i.e. based on the state in which they are available in nature. They are classified as solid fuel, liquid fuel or gaseous fuel.
Chemical fuel is the substance that releases energy when they react with substances around them. Fuels are mainly composed of carbon. The burning of fuels takes place when they react with oxygen which is present in the air and produce carbon dioxide.
The reaction involved in burning of fuel is mentioned below:
\[C+{{O}_{2}}\to C{{O}_{2}}\]

Hence the correct answer is option (A).

Additional information:
The characteristics of a good fuel is mentioned below:
The good fuel is less expensive.
It has high calorific value.
It is easy to transport.
It is easy to store and has a low moisture content.
It does not produce any toxic substance after burning.
It burns easily in the air and has a moderate rate.
It should not leave any unwanted residue.

Note: The energy which is produced by the combustion of one Kg of fuel is known as its calorific value. The calorific value of a fuel helps us to differentiate between types of flues. Fuel having the highest calorific value is considered and should not affect the environment is known as ideal fuel.