Combustion is the process of burning of a substance in the presence of air or oxygen with the liberation of heat and light. Substances that burn in air or oxygen to produce heat and light are called combustible substances. They are also known as fuel. Substances that do not burn in air or oxygen are called non-combustible substances. Products of combustion depend upon the nature of the combustible substance. Most of the fuels that we use are hydrocarbons. when these hydrocarbons (present in fuel) burn completely, the products formed are:

Carbon dioxide, water and energy

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Carbon monoxide and Carbon dioxide

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Carbon dioxide, water and air

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Oxygen and Carbon dioxide

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Solution

The correct option is A Carbon dioxide, water and energy
$Hydrocarbon + O_{2} \to {CO}_{2} + H_{2} O + Heat Energy$

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Similar questions

Q. Write one word for the following.

1.	The process of burning a substance in the presence of air or oxygen	....................
2.	A region where combustion of fuel takes place	....................
3.	Substances that produce heat and light energy on burning	....................
4.	A fuel that is generally black or brownish-black in colour	....................
5.	A type of coal with carbon content of around 92−98%	....................

Q. All combustible substances are not fuels. Why?

All combustion reactions are always exothermic which occur in the presence of excess air or oxygen. Substances acting as fuels undergo combustion when heated. It is not necessary that a particular substance undergoing combustion may burn also. The human body is just like a furnace or machine in which various foodstuffs that we eat undergo combustion. They provide the desired energy needed for the body's function.
Why is L.P.G. preferred to coke as a fuel?

All combustion reactions are always exothermic which occur in the presence of an excess of air or oxygen. Substances acting as fuels undergo combustion when heated. It is not necessary that a particular substance undergoing combustion may burn also. The human body is just like a furnace or machine in which various foodstuffs that we eat undergo combustion. They provide the desired energy needed for the body's function.
What are the main constituents of L.P.G.?

Q. Fill in the blanks using the words given in the box.

ignition, petrol, combustion, calorific value, combustible, inflammable

(a) A chemical process in which a substance reacts with oxygen to give off heat is called ______.
(b) Wood, paper, CNG are __________ substances.
(c) The lowest temperature at which a substance catches fire is called its ______ temperature.
(d) Ignition temperature of _______ is lower than that of wood.
(e) The substances which have very low _______ temperature and can easily catch fire with a flame are called _______ substances.
(f) The amount of heat energy produced on complete combustion of 1kg of a fuel is called its ______.

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The correct option is A Carbon dioxide, water and energyHydrocarbon + O2 → CO2 + H2O + Heat Energy

The correct option is A Carbon dioxide, water and energy
$Hydrocarbon + O_{2} \to {CO}_{2} + H_{2} O + Heat Energy$