Question

Rapid combustion is:
(A) when gas burns, it produces heat and light.
(B) when material suddenly burst into flames.
(C) when there is an evolution of heat.
(D) none of these.

Answer 1

Hint: In this question, we have been asked about rapid combustion. So, for that, we will be discussing combustion for better understanding of rapid combustion. Also, there are 5 types of combustion complete combustion, incomplete combustion, rapid combustion, spontaneous combustion and explosive combustion. We will be discussing rapid combustion in which large amounts of heat and light energy is released. This often occurs as a fire.

Complete step by step solution:
In this question, we have been asked about rapid combustion,
So, for that, we must know about combustion,
During combustion reaction, a substance reacts with oxygen from the air and transfers energy to the surroundings as light and heat.
We can also say that Combustion reaction is a high-temperature exothermic reaction chemical reaction between a fuel and oxidant.
Now, we will be moving to rapid combustion,
So, rapid combustion is a form of combustion in which large amounts of heat and light energy is released. This often occurs as a fire. This is used in the form of machinery, such as internal combustion engines, and in thermobaric weapons.
From this, we can say that rapid combustion is combustion in which a substance burns rapidly and produces heat and flame.
Some more examples of rapid combustion are the combustion of LPG gas and petrol.
Also, the substances which undergo rapid combustion have lower ignition temperature.

So, from this, we can conclude that option (A) is correct.

Note: Rapid combustion needs to occur in presence of oxygen, a reaction occurring anaerobically would not be considered under rapid combustion. Also, as we know that rapid combustion is also an exothermic reaction, so don’t get confused in choosing the correct option.