Question

Which of the following is an example of rapid combustion?
A. Burning of wood
B. Burning of LPG
C. Burning of coal
D. Burning of a candle

Answer 1

Hint: It burns to form water vapour and carbon dioxide, as well as heat. It’s a mixture of commercial butane and commercial propane having both saturated and unsaturated hydrocarbons.

Complete step by step answer:
What is Rapid Combustion?
Combustion is basically an exothermic oxidation reaction. The process in which a substance combines chemically with oxygen at a temperature above its ignition temperature with large evolution of heat and light in a short span of time is called rapid combustion. Whereas, in spontaneous combustion the substance catches fire as soon as its temperature reaches the ignition temperature.

Let us know about LPG!
LPG (Liquefied Petroleum Gas) is a hydrocarbon gas that exists in a liquefied form. LPG is a colorless, low carbon and highly efficient fuel. It boils at a low temperature and to avoid it evaporating due to its low boiling point, it is typically stored in pressurized steel vessels such as gas bottles or bulk LPG tanks.

Now, let us see why burning of LPG is a rapid combustion?
Burning of LPG is an example of rapid combustion. In this combustion, the combustion of combustible material is complete. LPG burns rapidly and produces heat and light. When the gas burns in air it is a chemical change. Combustion of LPG is a chemical change because, after its combustion, the new substance formed changes chemically and cannot be turned back into LPG.

Therefore, Burning of LPG is an example of rapid combustion.
Option B is your answer!

Note: Due to the low boiling point of Liquefied Petroleum Gas, it is stored in a pressurized, cooled liquid form, which on exposure to the skin, can result in severe cold burns to frostbite due to the rapid drop in temperature.