Question

A physical process in which a substance reacts with oxygen to give off heat is called combustion

• A. True
• B. False

Answer 1

The correct option is B False

Combustion reaction:

• The chemical process is one where the reaction occurs between fuel and oxygen to give off heat and is called combustion.
• Heat and light energy are released during this reaction. The flame then develops from the energy of heat and light.
• The Combustion reaction formula is
• $\mathrm{Hydrocarbon}+\mathrm{oxygen}\to \mathrm{Heat}\mathrm{energy}$

Chemical changes in combustion:

• Combustion is a chemical process where substances are converted to two or other new products.
• As combustion of a hydrocarbon produces a new compound and it is irreversible so, it is a chemical process.
• The physical change does not occur in the combustion process as it is a reversible one and no new products will be formed in case of physical change. So, combustion is a chemical change.
• Examples of combustion processes are the burning of coal or wood, Car and buses burning petrol or diesel to run.

Therefore, the given statement is false.