Which of the following statement is true regarding combustion?
Answer & explanation
Correct answer: option 3
The correct answer is option 3. It is a chemical process in which a substance reacts with oxygen to give off heat.
A chemical process in which a substance reacts with oxygen to give off heat is called combustion.
The substance that undergoes combustion is said to be combustible. It is also called a fuel.
The fuel may be solid, liquid or gas.
Sometimes, light is also given off during combustion, either as a flame or as a glow.